No, it isn't just the worst examples of it. You really need to analyze group dynamics if you think it's just the negative parts. For instance, team building occurs through constructive AND destructive means. Not only that but if your task requires competence to watch out for your fellow man's back, then when you DO NOT TRUST SOMEONE to have your back, what do you think occurs? Are your precious feelings, or by proxy their precious feelings worth putting the team at risk?