Saftey is unproven? Are you nuts? An underground train station, with limited space, limited egress, trains moving through, and high voltage. Sound pretty safe to me, too.
Look, I'm all for everyone getting their say, but saftey comes first.
I go cross-eyed every time someone says how egregious it is that BART cut off the cell phone service. I'd like to have cell service in my underground train system. I rather suspect, BART took note of the recent London riots that were flamed by idiots with their cell phones and didn't want a repeat in their expensive facility. Cell services isn't a god given right. As a commuter, I'd be annoyed there was no service, but furious a bunch of people want to deny me my ride home.
So, the original intent was to protest someone being killed by the BART police. Why not protest outside the BART offices then? The communters didn't have anything to do with it.
Finally, if you're going to stand on the escollator, do it on the right. The left side is for walking.