Not Truth-er, Truth.
As in US foreign policy meddled in the Middle East, and the Middle East meddled back.
In theory, small government types are opposed to government intervention both foreign and domestic.
Our meddling in the middle east before 911 has been pretty much written off as laughable by most informed scholars. Meddling wasn't the primary reason these nuts attacked us because you'd have to ignore a large body of evidence that shows their their knowledge of foreign intrusion, their knowledge of international affairs and events, their knowledge of intentions vs. results isn't anywhere near well informed. Their world is colored by a nearly entirely corrupt ME way of life; dictatorial gov'ts with broken school systems and dogmatic Muslim fundamentalism is hardly the ideal environment for someone to grow up sane, well adjusted and informed. In that scenario it's not difficult at all to envision ME teens believing that Americans actively look to kill innocent Muslims, something fundamentals would claim as truth whether we stopped killing innocent Muslims by accident or not, because to them it has already happened and therefore can really never be forgiven, so it's baked into the cake no matter what we do going forward short of withdrawing entirely, embassys and private industry et al, from the ME.
Most kooks who subscribe to this blowback notion (not the idea generally, which is sound, but in the case of 911) can't reconcile how despite a massive increase in meddling in the ME over the last 10 years since 911 that we haven't been attacked once, yet the very moderate amount of meddling over the prior 20 years (including what was universally considered positive meddling by Afghani's against the Soviets in the 80's) yielded several terrorists major attacks including the Cole.
Fact is we could pull out of the ME entirely, stop supporting Israel publicly (pure stupidity) and you'd still have ME Islamic fundamentalists claiming Americans are their enemy purely because we are almost exclusively non-Muslim. The hatred is rooted in something America can't give fundamentalist Muslims, and that's an extremist Muslim caliphate sponsored by the U.S. gov't. Anything short of that for most fundamentalists is enough reason to attack the U.S.