He is checked by other parts of the government. I agree with part of what you say as well and I understand your fear. I am from the northern Mediterranean and a lot of people mistake me as being Arab and Muslim (Even though I have nothing against Arabs or Muslims and I am fascinated by their culture), which has lead to several threats. Just remember, he is only one man, and we don't know how well he will do when put under the scrutiny of the entire US, half of which are Left wing, and the other quarter undecided, with a massive government who will be watching his every move as he has far less political experience than most past presidents. But on the good side, Who knows, he may surprise us. When people are under massive amounts of stress they get made to do things that please the masses not themselves, so only about 20% of the things he campaigned on will actually be brought into legislation. Also, the freedom of speech is a major guaranteed right and unless you threaten or harass someone or the government, you are free to share your political beliefs with the public and they can't hurt you physically. If they do, you have a legitimate defense and they will face charges.
As for us specifically, ASD ETC, I think the best thing to do until our choice of candidate, is to conform to the expectations we are given. Blend in and move with the political majority or just be centrist. The more opposition we display the more negativity we will receive and personally I would rather be happy and conformist then deal with constant negative feedback from people. Our country is still far better than many other places around the world and part of me is thankful that we have a government with it's size and diversity and has the capability to limit the power of the head of state, making dictatorship impossible or at least very difficult.