I don't know that that means they were violent and lazy. I would call that passionate.
Beating up anyone in uniform, 5 on 1/ 10 on 1/ and even worse odds, with bricks, & sodomizing them with nightsticks & broken bottles however, does. Which is what happened to hundreds of ROTC students nationwide. As well as all the arsons & bombings on campuses, and the thousands upon thousands of assaults upon returning service members from overseas, which are far better known. Even before one accounts for c*nts like Hanoi Jane, and terrorist organizations like the Weather Underground (so violent the
Black Panthers disassociated themselves from them!), & deliberate riots like The Days of Rage in Chicago organized by the SDS (Students for Democratic Society) whose
intent were assaults/interpersonal violence, vandalism, home invasions, & to "bring the war home" (not bring servicemembers home, but bring the violence of war to the streets of America)
On a less organized front; The massive use of amphetamines (which was popularized by the hippy movement along with hallucinogens) also had the exact same effect then as now; meth-heads are super prone to paranoia, increased domestic violence, increased interpersonal violence & sexual violence, forced prostitution, delusions, & petty crimes (theft, home invasion/burglary, etc.), along with the common side effects of poverty that follows drug addiction around like a miasma. The Haight & similar places were really not safe places to live.
The thousands of religious cults, meanwhile, which profligated the 6o's & 7o's springing up from the hippie & new left counter cultures, were hardly all violent against their members or outside groups, but they were also the natural breeding ground for narcissistic abusers & provided limitless pools of victims for them.
While lazy I'd agree is up to personal interpretation, the violence of the hippie & new left movement is very well documented.