That depends on if the police were doing it intentionally or were overwhelmed. I have trouble blaming a 3rd party for the actions of the first 2.
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To summarize I think the following based on my understanding of events.
1) I do not agree with the ideals/beliefs of racists but recognize their rights as US citizens. The First Amendment has limitations, individuals ignoring these limitations should be held accountable... even made an example of through our legal system.
2) Both parties had the right to voice their opinions (within the legal limits of the First Amendment)
3) Some people (on both sides) willingly engaged in violence, these people need to be held accountable for the laws they broke (regardless of the side they were on)
4) I think *some* of the people on the "alt-right" might be good people with some bad/misguided beliefs, I fully recognize people like David Duke as being irredeemable.
5) I think that the individuals on the "alt-left" mean well, some just overreacted.