Regime change in Syria on one level, is exactly the right thing to do. The problem is that it creates complications based on how it is executed.
Looking at the recent track record, stating that regime change is the right thing to do requires extra-ordinary proof. Not just that it is required, but that there's any hope of turning the situation into anything but a human cesspit costing an incredible amount in terms of both treasure and blood.
Few argue, in 20/20 hindsight, that taking out Saddam was correct.
Everyone is mute on whether taking out Gaddfi was correct -- we're just lucky that we're not saturated with constant news of what a colossal ****-up Libya is now; otherwise people might actually have an opinion on that disaster which would be negative for a certain presidential candidate.
So, let's ignore lessons of recent history -- things that we should know from watching the nightly news over the last 15 years -- and make a simplistic statement that this time we'll do it right.