I would have to say that there are very few celebrities that are good role models young people period. They live in a bubble, and even if they came up the hard way as some did, they have lost that feeling of survival. It is replaced by competition with other elites.
As for the three you mentioned, they fit into that elite bubble, but being politically vocal is not their strong point. They are not good role models in that respect. Their politics should have been kept to themselves, but if they had to do politics, it should have been confined to the voting, and not post election whining.
The American Way is through a Democratic Republic envelope. In it, we elect the people we want to represent us in the country. When the election process is over and they are unhappy then vote again in the next election.
They should abide by the winner of the election and do their best to help the country through its elected body in congress and the executive office. They are also free to run for public office themselves, and if they are over 35 years of age, and a natural born US Citizen they can even run for the presidency.
But what they are doing with the protests and riots is tantamount to domestic terrorism or even sedition.Trying to bring Washington to a halt by any means makes the US vulnerable to attacks by other countries and terrorists that can try and take advantage of the situation.
So no is my final answer.