[hueving]

Bash other people's novel work while peer reviewing it anonymously, then steal it and submit for publication at another conference before the rejection notification goes to the original author.

Once someone makes it into the review pools for top conferences, they receive a constant feed of good ideas to harvest in the form of submissions.

[robotresearcher]

That's the pathological case, yes. People can also go steal cars and rob houses. But they usually don't.

Good luck getting a reference from someone after stealing their idea.