Violence is never an appropriate response. However it's funny that this is actually the "we the people" that spidey is always cheerleading. The union members are actually more like the average person. They aren't wealthy, they're an average working person, and they join a union to protect their workers rights from the corporatocracy that the far right wants to have. This is the actual we the people, the actual people getting screwed over. Not the rich 1 percenters that people like spidey wants to protect. And the reason you have these type of people resort to violence is that unlike the rich people spidey and the Tea Party looney tunes want to help, these union members are actually in need and hurt by conservative policies. Not the made up bullshit spidey would like you to believe affects the upper 1% that the right is protecting.