Even looking only at different cultures, saying nothing of nature, the degree to which people are willing to cooperate or defect against the group varies widely. The level of trust varies widely.

People aren't motivated solely by the risk of being caught. Some people tell themselves that everyone else must be trying to cheat, so it's okay for them to cheat. But this type of thinking isn't a law of nature, it's just a human flaw.

The amount of cheating is not a fundamental constant. Given that people are social animals and that we tend to be stronger as a group, in fact you'd expect that prosocial behavior is good for the species. If fucked up is to mean anything, poisoning the environment with forever chemicals ought to make the fucking cut, if you'll pardon my French.