There seems to be a lot of gross over simplification of the situation going on. At the moment it's not the Assad regime vs the rebels. It's the Assad regime vs some 40 different groups. Some are Syrian rebels but most are external groups with their own interests. Some are al-qaeda affiliated and other extremist groups whose purpose is either sectarian slaughter or getting their hands on Syrian weaponry to use elsewhere.
So what are the options to achieve what we're being told the western goal is. To stop further use of chemical weapons?
Can we bomb the weapon stockpiles? No short of nuclear attack all that will do is release the chemical weapons into the atmosphere and kill thousands more people.
Can we take out the other parts of the military? Yes. But then who's going to stop the extremist groups from then getting their hands on the chemical weapons if we kill the army defending them?
Can we take out the regime? Yes. Probably at the cost of a lot of civilian lives. But then what? We have those 40 different groups vying for power. This would lead to more civil unrest and sectarian slaughter that would make Iraq's ongoing sectarian war look like a nice day at the park.
So that leaves only the option of going in and sorting it out on the ground. Which will probably lead to another few thousand dead allied troops and another decade long insurgency/terrorist truck bomb massacres.
It's a nest of vipers that is best kept out of.
As for the moral argument about killing people to stop people getting killed. What absolute rubbish. Did we get involved in Liberia, Sudan, Sierra Leone, Zimbabwe, Rwanda and countless other countries where genocide has been rife over the last 30 years?
I also find it very odd that people suddenly swallow the media perpetuated notion that Assad is some kind of Hitler style maniacal tyrant when all of 3 years ago Syria was lauded as a beacon of relatively secular, stable Arab state ideal. Granted he could've stepped aside when the will of some of his people moved peacefully against him. Then we could have Syria the same peaceful, prosperous and stable Arab country that Egypt has turned into where 1000+ people don't get openly slaughtered in front of the world's media in a single day.
Oh no wait.
Let's face facts. There's 2 reasons why the western allies are chomping at the bit to smash Syria. To protect Israel and to **** one over on Iran. They don't give a shit about saving Syrians. They blow more Syrians to pieces in 1 day of cruise missile and drone strikes than Assad or the rebels could even dream about.
Only other thing I can say is thank **** the UK parliament voted no to war any circumstances. It restored some of my faith so representative politics in the U.K.