Winning an election, (especially when only rather marginally) does not in any way and nor should it, prevent anyone from protesting, making their views heard or taking any lawful action against any decisions or policies, made or implemented afterwards by the victor/s. In fact, many people would have voted for Trump on perhaps a singular issue and may well not be happy now or in the near future with how things are being dealt with outside that singular issue...and yes, these same people also have the right to protest against those dealings and decisions too.
I say keep going hard with the protests and use any lawful peaceful means available to help your disagreement with what is happening get heard!
Not unreasonable
Mike