If the West (and USSR/Russia) hadn't been meddling in the political and social affairs of the Middle East for decades, it's completely possible that we wouldn't have any/many Middle Eastern terrorists with the funding and capabilities to do any damage outside their own countries.

It's tempting to suggest, "or if we had done a better job with our meddling", but... no, it just doesn't work, empirically so, and we should stop doing it.

Unfortunately, pushing diplomatic solutions hard would be political suicide in the US; the "us vs. them" mentality is strong here, and I don't think most Americans would be ok with what they'd see as giving in or giving up. And even if the politics at home could work, it's unclear if all that many on the other side are interested in a diplomatic solution, given how radicalized some of them have become due to our recklessness and hubris.