Also, "presenting solutions" is really not the protesters' obligation in a situation like this. Forcing a crisis that elevates as far as possible and draws attention are reasonable ends in and of themselves. These kinds of action are how, historically, political debates shift focus. Solutions are not hard to come by. There is no shortage of them. The state needs escape from prop 13, from ballot initiative spending mandates, from its high incarceration rate, and so forth. Implementing those solutions requires action by voters, the legislature, the regents, and so forth.
You have to start somewhere and that's what your peers did today.
Incidentally, the violence score appears to be roughly: Protesters - shoving some crowd control barriers; Cops - clubbing with batons, indiscriminate use of pepper spray, and allegedly at least one rubber bullet fired.