is it a sin to "coorperate" in the sin of another, by advise, enabling, or by council?

Answer 1

Yes. Although sin is a personal act, we share in the responsibility for another person’s sin if we cooperate with them in any of the following ways:
* by directly and freely taking part in the sin;
* by our advice, encouragement or approval;
* by not reporting them or trying to stop them when we are obliged to;
* by protecting or hiding them. (1868)

Their hands are upon what is evil, to do it diligently; the prince and the judge ask for a bribe, and the great man utters the evil desire of his soul; thus they weave it together (Mic 7:3).

Some good examples in the answers so far.

Cheers,
Bruce

Answer 2

Yes. Aiding and abetting is a crime and a sin by most religions' standards. That is why the get-away driver goes to jail in a bank robbery along with the thief.

Answer 3

yes for instance we drive someone to have an abortion, we also are guilty of the sin she did in killing her unborn child. Both are in mortal sin.

Answer 4

if you know what your doing is wrong or know that it can cause harm to another no matter the level of severity then yeah it is a sin casue you are consious to the fact that what your doing is wrong.