[You give Trump way too much power.]
Do I?  Let's look at the after effects of his words on Charlottesville.  With San Diego (or was it San Fransisco?  I often get the two confused) and now Berkley we a see a massive turn out for counter-protesters.  One explanation for this is that there is a clear disinterest by Trump to condemn racism.  At best, he'll offer lip service and only after vehement condemnation by his own party.  This is only further supported by Trump's pardon of Arpaio's racist conduct in direct contradiction to Constitutional protections for US citizens and legal visitors in the US.
[I don't see how Trump being all of the bad things you mention justifies]
The point is not about "justification" but about rational, plausible belief.  You should realize how a person's "belief system" (which is how I believe you justify your subjective conclusions) can create an incentive if not an outright need to act.
(ugh multiple comments but only 29 left)