The destruction of one of the founding worlds that made that utopia happen somehow doesn't make sense. They could have blown up Earth in stead, as far as the Federation is concerned the difference would have been negligible. This is not utopian and if it were realistic in any fashion it would cast a very dark cloud of doom over the Federation for a long, long time. Just imagine if the state of New York were entirely wiped out by terrorists. I doubt America would recover from that any time soon, and nor would the world as there would be hell to pay I'm sure.