Obama has made mistakes but so did Bush by invading. There's no good case for U.S. military intervention now.
Rand has said that we must destroy ISIS (disagreeing with his dad on that point), but he is also correct when he says we shouldn't be choosing sides. Aside from our allies the Kurds, whom we should arm to the teeth (how do you say "Contra" in their language?), much of the other side is allied with Iran. We don't want to help them win either. Assad is their ally; so is Hezbollah. So are most of the other Shiite forces. Let's not increase their power and influence.
Sen. Paul has also said that if we're going in, we should declare war, and I agree with him. And once you get that declaration, go in full blast, get the job done quickly, and get it over.
Many people nobody would accuse of isolationism thought President Bush made a mistake by going to Iraq.
I know you don't like the Pauls, but let's be fair here.