I'm not going to take sides with either faction here but this may explain why someone would want to protect themselves, even in a house of worship. The gulf between a group that believes one thing and another group that believes the opposite is growing ever wider. Who's to say that what we see in this video would not escalate in bodily harm to the people praying at some point?
http://www.youtube.com/watch?v=mp0oMKGFTyk