People keep using the "we did bad stuff once or failed to act when bad stuff happened so what right do we have to intervene now" argument.
This is utter nonsense. Two wrongs do not make a right. They make twice as much wrong and the prospect of more!
By failing to act we are turning a blind eye to the use of an horrific type of warfare. It takes billions to make a nuke, it takes only the will to make sarin. Allow this to go unpunished and you give a green light to all those who previously held back from using these indiscriminate weapons.
It is also rather narrow minded to use the perceived consequences of action in Syria as a reason to allow this to go unchecked. There is the rest of the world and it's future to think of too. So just as failure to react to African genocides is no reason to not act now. Failure to act now could well be the catalyst for future genocides and then are we to have the same debate?
"We didn't do anything when Assad gassed those kids so why should we intervene now x has wiped out a town with one juicy airburst"
I don't know what the appropriate response should be but I'm fucking glad some people care enough to try and do something.