The reason it's a mistake is because we have failed to create something utterly foreign to them. We have instead escalated the long-simmering civil war between islamic factions, a situation over which we have no influence and we are caught between. Crush them? Fine. Leave? Fine. But we will not change them. Moreover, we have eliminated any chance of major military action - boots on the ground - to defeat and rebuild a larger creator of terror, iran. The iraq war and aftermath needed to be successful at home before it could be the template to follow elsewhere. It failed at home.
"We" did no such thing. If they are escalating a civil war, that's their doing. Don't make the lefty mistake of attributing all decisions and actions by foreign people to something "we" did.
Moreover, we have eliminated any chance of major military action - boots on the ground - to defeat and rebuild a larger creator of terror, iran.
I'm not convinced that "boots on the ground" in Iran was ever in the cards, ever planned or desired by anyone in a position of power, in the first place.