American civvies have a role and blame in everything America does since we vote for our President and Congress, regardless which way anyone votes (or doesn't vote). The price for our freedom and power is responsibility.

So yes: 9/11 was quite deserved in the sense that we poke(d) our dirty noses in other peoples' (Middle East's) business. This is separate from civvies getting caught in the crossfire, which is tragic regardless of blame; there is a reason deliberately targeting civilians is a war crime.

For another example: Germans who ultimately voted for Hitler and the Nazi party and thus played a role in the Holocaust, among many other travesties.