It's not liberalism per se. It's sheltering kids from the realities of the world. Something that happens a lot at home or at church or in school or on TV by political leadership.. It's what happens when folks try to control the dialogue and the language by "censoring" terms like Islamic terrorists, or not educating about the world.
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Here's the problem with that mentality. "Islamic Terrorism" (really, just people of the third world taking a shot at their oppressors, but we won't have THAT discussion, too scary for most of you people) are kind of like shark attacks. Really kind of scary, but statistically rare.
You are, of course, more likely to be murdered by a family member, lover or neighbor than a scary Muslim. Or just some poor kid who wants to boost your wallet because no one bothered to teach him how to read... but again... not sensational like "Terrorism" (a word I would TRULY like to expunge from the English language).
So these girls went to a tourist spot that millions of Europeans go to every year, and they ran into the wrong angry guys...