The ones being violent should be arrested or given a light punishment as long ad they don't kill someone but the whole group should not be punished.

Well I do blame the police. It's their job to prevent this from happening and they know beforehand when a protest will happen. If it's a big crowd then send in more cops.

So you blame the police for not having enough people to police a large group of people because it's somehow their job to be in multiples places at once. Somehow the police magically knows how many people will show up and how much manpower they will need to police a large area when they are already shorthanded.

I believe you really need to think this through a little more.  Blame is always easy to throw around unless you fully know the situation.  It would be much easier if the police just deny the rights you just told Pemalite these groups have and not let the protest happen at all since there is no way to know how many people will show up to these things.  It's not like there is a poster with the numbers advertised somewhere, especially since a lot of people can come from out of town.

We have a lot of police in this country and there is an approval process for these protests so they are informed beforehand about it and they should do a better job at being more prepared. This isn't their first protest so they can come up with a good estimate on the amount of participants bad on other protest.

Jason you are being very naive about this.  Yes, the protest which was the conservatives can be approved.  What is stopping the other people which was Antifa from coming.  There is no approval process for them and there is no way to know how many were going to show up and counter protest.  Its as if you are only looking at half the problem and not thinking about the total issue.  Anyone can just show up to these protest and there is no way to totally prepare or being in multiple places at once for already shorthand amount of Police.  

You are correct this isn't the first rodeo and the problem remains the same, not enough police for the area to police.  So what should happen is they deny any protest period and they would not have to worry about the issue at all.

You basically summed it up in the second half of your post. This has happened before and continues to happen. The police should know better and be better prepared for these situations. It's their fault for not being prepared. Denying them their right to protest is illegal and it would just be the cops being lazy.

You must not live in the US.  Cops have been doing that for years.

So how do you become better prepared when you do not have the personnel.  Its very easy to make this statement but I do not hear any solutions coming from you.  How do you police an area you do not have enough people to be in all areas at once.

So its the police fault because they do not have enough people is this the only way you see it.  Needless to say, I am guessing you have absolutely no experience in this area.  How many protest have you been a part of in during your time on this earth.  I have been in a few and I can tell you this.  If you believe that there will always be a cop around to support your right to protest while another side is counter to you exercising your right you will always have someone to blame but it will mean nothing if you are getting stomped into the dirt.

It's the mob mentality from like-minded peers that is the issue.
https://en.wikipedia.org/wiki/Herd_mentality

Far-left and far-right groups that resort to any sort of violence tends to fester such nonsense ideas internally for long periods of time... Hence why I believe they should all be shut down until they can understand the limits to their rights, it's extremism at the end of the day.

They have the personnel to send a sufficient amount of officers to these protest.

If this was the first time something like this has happened I won't be blaming the police. The issue is that this keeps happening and the police are not prepared. I'm not a protest person but I have been to a few. All cops have to do is stop people from getting seriously hurt. Get involved when they see that violence is about to erupt and try to stop it.