Suggesting we benefit from and should tolerate some degree of assholes is not some kind of justification for asshole behaviour. It's a similar effect where we wouldn't care about computer security if criminals and black hats didn't exist, which would leave us incredibly vulnerable. This doesn't entail that we should proactively hire or encourage criminals and black hats to attack us.

The fact that the problems I pointed out are external is because those were just the most obvious failure modes, do not take it as an exhaustive list.