Jordan Peterson comes to my mind. Although I have no respect for his opinions at all, I still think that, in the end, scientists have their political views and should be allowed to talk about them. What they shouldn't be allowed is to insinuate that these views are anything other than their personal views. Hate speech and political extremism should also not be allowed because these damage the reputation of their university.

Other than that, I don't think it's right to tell them not to use their status to influence politics and society towards what they perceive as making the world better. On the contrary, they might have some duty to do just that.