Trump railed against the system, even saying the election was rigged - so you are saying he is right but about what - I note now he is spending his time defending the legitimacy of his election. 

Re protest - it is not always the last course. Indeed it may lead to negotiation and rethinking of ideas - not likely in Trumps case but if enough people express doubts and protest it will likely shape the midterm elections and it may influence other levels of government.