According to so many people telling a lie is something morally wrong, in spite of it being a common fact in our lives.

"So" not needed, doesn't sound natural. Need subject for "being"

Even scientists have proven the evolutionary need for lying for many species very close to us, such as, chimpanzees and orangutans.

https://www.grammarly.com/blog/such-as-comma/

Obviously, everybody lies, but ithat doesn't supposemean being a compulsive liar.

I don't really understand what you're trying to say; perhaps you want to use "mean" here rather than "suppose?"

To me, there are certain sorts of unregrettable lies.

"Unregrettable" is OK but uncommon. "Sorts" is also OK but a little awkward. Might say, "To me there are certain kinds of lies that one doesn't regret."

ITo mean, those in which lies behind a bad purpose there are certain kinds of lies that one doesn't regret, for example those done for a bad reason.

"I mean" is more a conversational expression than a written one. "Lies behind" expresses a position in space rather than a kind of lie. "Purpose" is also fine but "reason" is more fluent.

It is thateir goal whatich makes them unethical.

An unfortunately typical case comes from politicians, when they take advantage of their positions for the sake of themselves,; for example, taking up thea public contract offer in favour of companies linked to their relatives.

Good use of comma with "for example." I'd use a semi-colon after "themselves" to make the sentence less of a "run on".

Although I do not have to go so further.

Two comments: 1) in terms of English usage, "although" is unnecessary and "so" shouldn't be part of the sentence; 2) in terms of the essay, you've only given one example of a lie done for a bad reason so including this sentence here is not logical.

In our daily lives, we tell lies in order to justify why we are getting late again at work, to avoid keeping in touch with someone we don't especially like,... etc. There is an endless list of examples infor this issue.

"..." is not usually seen in formal writing. You don't usually see "getting" used with "late." Could also say "of this issue," but not "in this"

On the other hand, there are situations where it is acceptable, even ethical, to lie, if that means helping others or avoiding other people being offended (frequently one's closest relatives, friends and a/or partner).

Such is the case of having to say to your cousin how beautiful is his drawing is, though you can't understand what he wanted to draw.

Or let us think about a friend who has given up looking for a job during an economic crisis, and you have to support him, even though you think he has not enough experience as toto actually get a job actually.

In summary, the best answer to the essay's questions is that it depends on the case and how you behave, rather than the simplye fact of lying.

According to so many people, telling a lie is something morally wrong, in spite of being a common fact inpart of our lives.

"so" feels a bit unnatural here. "According to many people" definitely still emphasises that this is a popular opinion :)

Even scientists have proven theat there is an evolutionary need for lying forin many species very closely related to us, such as, chimpanzees and orangutans.

Obviously, everybody lies, but ithat doesn't supposcondone being a compulsive liar.

To me, there are certain sorts of unregrettable lieslies which are inexcusable.

"unregrettable" means that someone has no remorse for what they have done, which doesn't quite fit here. "Inexcusable", "unpardonable", or "indefensible" are some options that could work well :)

I mean, those inlies which lies behind aare used for bad purposes.

Rearranged the sentence for clarity and fluency :)

It is that goal wthat makes them unethical.

An unfortunately typical case comes from politicians, when they take advantage of their positions for the sake of themselves,ir own benefit: for example, taking up thea public contract offer in favour ofto support companies linked to their relatives.

Although I do not have to go soany further.

A more natural way to say this would be "There is no need to elaborate. The list goes on." :)

In our daily lives, we tell lies in order to justify why we are gettarriving late again at work again, to avoid keeping in touch with someone we don't especially like, ... There is an endless listsupply of examples in this issue.

"list" is fine as well, but I think "supply" sounds slightly better.

On the other hand, there are situations where is acceptable, even ethical, to lie, if that means helping or avoiding offending other people be offended (frequently closest relatives, friends and a, or partner).s) --

Ssuch ias the case of having to saytell your cousin how beautiful is his drawing, is, even though you can't understand what he wanteds trying to draw.

Haha that's a great example :) I've joined it to the previous sentence because it doesn't stand as a sentence in its own right.

Or let us think aboutconsider a friend who has give up looking for a job during an economic crisis, and you have to supportencourage him, even though you think he has notdoesn't have enough experience as to get a job actually.

Another great example

In summary, the best answer to the essay's questions is ithat whether it is wrong to tell a lie depends on the casesituation and how you behave, rather than the simply fact of lyi. It is simplistic to say that lying in itself is wrong.

I've just expanded on this to better summarise your response :)