Yes and no.
We have a a government made up of politicians who were educated for free, claim expenses that are frankly unjustifiable (still).
We have that very same government basically ignore the student protest, the prime minister decided that it was more important to be on the other side of the world in China / South Korea rather than deal with a pretty major domestic issues, an issue where he's in the wrong in my eyes (and I'm a Tory).
If Cameron had the balls he would have been in London on the day and addressed the students to justify the cuts that he was making.
If you have a march, and the government basically completely ignores what you have to say (hell, the prime minister feels that he doesn't even need to be in the country at the time), then perhaps it is time to take it up a notch.
Which is why I said, it was the Tory HQ that they attacked ... so it was not random violence, but frustration possibly at the Tories deciding that the student march is not important enough for the PM to even be in the country.
Doesn't matter who owns it, it was being used by the Tories. Anyone leasing the property to the party would be aware of the potential for protest/riots near it.