Maybe you just don’t know the definition of “irony”. People use it improperly all the time. I don’t think anything in that song by Alanis Morissette is actually ironic.
Personally, I don’t think there’s ever an excuse for cheating; academically it really only harms the cheater. People in college offered me a lot of money to do their work for them. I never accepted, but I also never tattled on them. Grades honestly, really, don’t matter in the long run.