because we knocked over Iraq without anything resembling a real plan for handling the aftermath
And Libya and Syria...
And Libya and Syria...
https://www.betterworldbooks.com/product/detail/Overthrow--A...
^^ Not completely without bias, but probably contains a lot of inarguable historical facts that you weren't even close to being taught in high school or even college.
From my perspective, it seems that GWB created the seed that would grow into ISIS. Then it was Obama that gave it the fertile soil to grow.
I also don't understand how fighting ISIS made it worse.