I’ve seen it. In my organization, open discussion and creating space for disagreement and alternate perspectives are the norm. A couple of junior programmers were upset about a process change, and weaponized the process to sow discontent at every retrospective, usually through vague “a lot of people have told me they’re unhappy about X” comments. A huge amount of energy was spent trying to take their concerns seriously and address them.
Eventually they were removed from the team. It should have been sooner, but the manager is very empathetic and supportive of his team. Morale immediately shot up and things are much better now, as well as more productive.
Not every workplace is a dog-eat-dog hellscape. In fact, I’d say they’re the minority. But you do reap what you sow: if you’re determined to see it as a zero-sum game and go looking for conflict, you’ll find it.