People in groups are notoriously stupid – not because any individual is, but because people blindly trust & follow group consensus instead of their own common sense.
This is proven by social media every second and you are not immune.
Of course – groups of people can yield amazing things. But whether the outcome/output of a group is considered positive or negative or successful (or not), it has little to do with whether group dynamics are at play or not. They are an incredibly powerful force & few are immune.