Unless there is a specific threat that we are not privy to it is a complete overreaction. The odds of being the target of this individual(s) are one in the tens of millions. I face more danger every day in commuter traffic on the beltway. It is not about money it is about common sense vs. emotional knee-jerk reactions. Life goes on. We as a society should not shut down because of some whack-job or terrorist (the jury is still out on which it is). Sure, we can be a little more wary of our surroundings and a little more vigilant but we should not hide under our beds because of some statistically imperceptible threat. Children face far more dangers in their everyday routines than from this sniper(s). Children drown in pools all the time - should we fill every pool and fence off and patrol every body of water because some kid might drown?
What kind of message do we want to send to those that wish to do us harm? Part of the reason that 9/11 occurred was because we had a President that had our troops pack up and run from Somalia after the first US casualties (why they were there and the fact that they had no support is another discussion altogether). This emblodened Bin Laden into believing that we were a nation of cowards and would not strike back.
If you have damaged asbestos in your house, then hiding under your bed may be much more dangerous than taking your chances with the sniper.