Aren't we helping the rebels? Time to call it a day, let the Russians sink in this quagmire of hate.
While it came at a huge cost, including a large number of civilian casualties and some pretty egregious human rights violations, it is worth noting that Russia is basically the only country that has experience fighting in this sort of conflict and winning.
The War of Dagestan
and the Second Chechen War
are a fairly close approximation of what is current going on in-and-around Syria. You have fundamentalist Islamic fighters invading another country and capturing a significant amount of ground (as the Islamic State did in Iraq) with the invaders having previously taken control of vast swathes of a neighboring country with the "legitimate" government basically only having power in the capital. Likewise in addition to the main conflict itself there were numerous and horrific terrorist attacks on Russia (much like there have been in Europe).
As I say, the cost was great, it took a long time to finish and there are still issues today... but Russia undoubtedly won and these days the Islamic fundamentalists are reduced to isolated attacks rather than being a significant force. There's a reason that the Caucasus Emirate is basically a non-entity now.
I think we are helping some of the rebels, but there are so many different groups that combine and split apart all the time, it's a little hard to make sure those we are supporting are even semi decent people, instead of all of them being just assholes.
Sadly these days basically everyone who matters is an asshole.
There was an opportunity for us to support more moderate and reasonable parties but the west balked and as such those parties were largely destroyed. Simplifying things at the start of the conflict you had Assad (stereotypical "strongman" leader; pretty much a clear asshole but an asshole who generally kept the country stable and was developing the economy) vs an unholy alliance of the liberal opposition (the sort of people most hoped the Arab Spring was driven by and generally the least assholeish of the lot) and the Islamic fundamentalists (with the Islamic State having the most prominence but being far from alone). If we'd stepped in and given real support to the liberal side of things at the start then they likely could have taken control. Instead we did little, allowing the Islamic fundamentalists to crush them, seize territory, establish themselves as the only real opposition and then start this grinding war of attrition with Assad.
It's the same story as in several of the post-Arab Spring countries where in the vacuum that the loss of a Strongman left fundalmentalists were able to seize enough power to lead to never-ending civil wars. And it links in to what was mentioned above about Russia; the West isn't willing to do the things Russia did to end these conflicts and as such they drag on and on and on.