Let's take it one step further. Should they have been arrested at Cruz rallies since he is Hispanic? I know you're a cop hater, you've expressed it. How do you feel about this law?
My only thought is this... if you make police a protected class, this opens up other occupations demanding it.  
Is it a hate crime to punch a fireman?  What about the admin staff at a hospital?   Does this extend to the fat diabetic nurses at the local clinics too?   If we protect cops, why not priests?  Why aren't vets a protected class?  
After a while, you have mailmen and clerks at the DMV demanding special treatment - and abusing these rights.  
Everyone feels good applauding the police - but some would argue when it comes to running reds, speeding, drinking & driving off duty, etc... cops already get some extra free passes 

  and once you allow an occupation to do it - because they protect and serve - then you'll have 50 other occupations demanding it.  Wait until the $15 an hour McD worker is a protected class under President Trump 

  You'll love that, bro.