Earlier quoted context omitted.
You rejected ethical behaviour 'on principle', you even seem proud of that. Have you kept doing that in life? Do you feel like an impostor, presumably with your degree that you didn't think you could acquire without cheating, or couldn't be bothered? A surprising number of the replies to your comment also seem to think cheating like that at university is perfectly fine.
Why isn't it fine, though? What serious damage did his actions cause? Which important societal construct rests solely on the assumption that no students cheat and, once this is violated by a single student, comes crashing down? I would suggest that if such a construct exists, then maybe the problem is its very conception and this is what should be rethinked. I think the implication that he should feel like an imposto…
Society does not depend on wether or not a few students cheat.
But society definitely depends on the social and moral contract that we do not cheat, and that it is wrong. If most of us cheated, the system would definitely fall apart.
Have you ever visited a developing nation? Where outside of small villages it seems like everyone is cheating at everything, all the time?
It's like pouring sand into the gears of an engine: everything starts to break down.
I would not hire someone who admitted cheating during an interview unless they talked at length at their remorse, how they learned from it, how they grew from the experience, and there were exceptional circumstances.