Yeah, that's really charming.

If one of those undressed spoiled brats was mine, I'd cut off the allowance, the college tuition and re-write my will. They all need a lesson big-time in how capitalism, particularly global capitalism has enabled their families to be wealthy enough so that they can enjoy the luxury of demonstrating instead of having to actually work.

The public wearing of underwear is so edgy and brave. Look at me! I'm speaking stupid slogans on my butt to power!

You know, nine tenths of the problem with the contemporary left can be traced to the fact that they've come to see public protest as the be-all and end-all of political action, and a public protest is, essentially, a giant multi-person public temper tantrum. Now, there are situations in which a giant, public temper tantrum is appropriate and useful, but these are relatively rare, and do not include any circumstance in which argument (as opposed to righteousness) matters. You can't make an argument at a protest; the best you can do in a slogan is refer to one that people are already familiar with. But the slogan isn't a substitute for making the argument.

The nature of a public protest makes it very tempting to take the "tantrum" aspects and push them as far as possible, while attracting persons who enjoy that sort of thing. And the end result is people who think that behaving outrageously is just as effective as making an actual argument. Hence, underwear.