Why should someone consent to being apprehended if they are protesting the same laws that they are breaking?
The point behind civil disobedience is to publicly demonstrate the unjustness of the law, not fight it head-on. Remember when those nonviolent University students a little while ago got pepper-sprayed? Much, much better press for them and their cause than "students start brawl with police".
Some people believe civil disobedience doesn't have to be nonviolent, but most people agree on nonviolence and all the famous examples of civil disobedience were nonviolent (Rosa Parks, Thoreau, Gandhi, etc)
I said nothing about violence - in fact, your comment is the first on this page to mention violence - so I don't really understand where you're coming from.