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At least nine people were arrested Thursday night related to protests at the University of California, Berkeley, over an appearance by conservative commentator Ben Shapiro.

The university spent approximately $600,000 on security measures, including metal detectors, concrete barriers and police barricades, amid fears that Antifa demonstrations would turn violent.

Fox News contributor Tomi Lahren says it's stunning to see people on college campuses actively protesting for less free speech.

"They really need to change this, because I don't think they realize how damaging they are to themselves," Lahren said on "Fox & Friends."

She placed some of the blame on the mainstream media, which often empowers protesters and portrays them as "social justice warriors."

"And so when they do these things, they don't think that they're wrong, they don't think that they're violent. They think they're doing something positive. They think that they're doing their duty," Lahren said. "And that is the problem. These young people, they think that they're heroes because they're doing this. It's sick."

She also blamed Democratic lawmakers, arguing that more of them need to step up and publicly condemn Antifa "thuggery."

She pointed out that President Donald Trump and conservatives are often asked to denounce white supremacists and the alt-right.

"But then the left, they feel no responsibility to call out this? They feel no responsibility to condemn this? It's disgusting," Lahren said.

Watch more above.

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