Milo is a rampaging swirl of hair-dye and idiocy and should be relegated to obscurity as quick as possible.  
That being said, those protesters are fascist criminals that deserve to be locked in a cell and beat with a copy of the first amendment until the words "free speech" are clearly understood.  
On top of everything, unless they intended to make that silver-haired half-wit a sympathetic victim, all the "protests" (read: riots) are accomplishing is to make the participants into the obvious bad guys.
Grow up.  Don't like a speaker?  Don't listen to the speaker.  Protest the speaker, sure.  But you allow him to speak, you do not destroy public and private property, you do not shout down those who disagree with you, you do not act like a violent, petulant child and endanger the lives, property, and rights of those who have peacefully assembled to hear an invited speaker.