If by strong you mean "bad but prominent" than yes, they will sometimes try to encourage mob mentality. Interestingly, those with under developed Fe will occationally do such a thing as a form of compensation. They feel a need to have people agree with them, so they find disenting opinions threatening.
It's worth noting that inferior Fe can also have the opposite effect - it can cause people to disagree with others just for the sake of showing they are different. That's more a rejection of the inferior. The person tries to deny any connection to others and winds up becomes a sort of photographic negative of a conformist. Such a person doesn't want to many people to agree with them, otherwise the whole rebel thing doesn't work.