unless it's a mosquito with malaria or dengue :) (aka terrorist with nuclear/dirty bomb).
terrorism is, above all, politically motivated theatrical act that should manipulate audience into something (fear and thus irrational behavior, election choices etc). plus some stray dogs that are out of any reasonable control.
we humans are vastly irrational, and just because mankind landed on the moon doesn't mean emotions don't hold more power than reason in most of us. that's why so many people are afraid of flying, are superstitious, believe in horoscopes and so on. you know, general folks out there who have same voting power as you or me or anybody else