If I see an answer that involves some illegal activity, such as breaking license agreements, should I then mark this as Offensive or should I simply down-vote it?
There are some perfectly legal things which people may rightly be offended by, and totally illegal things which offend very few.
It may sound trite, but I'd mark it as "offensive" if it offended me. If it didn't, I wouldn't.
It doesn't do any harm to let someone know that their post - even though not illegal - causes offense to others.