"and killed something like 1400 people"
Pot Kettle black eh, who are you quoting - the guy who is trying to make more money for his countries war machine industry.
"He'd killed 100,000 people."
Really showing your bias here, that figure is the number of people thought to be dead from the conflict, killed by both rebels and gov't troops.
Both sides are bad, joining with one side would not be helping the civilians, quite the opposite - 10,000s more civilians would die.
You choose to believe your gov't versions of events, I don't choose to believe any propaganda. The point is when there is nothing but lies to base your decision about joining a war. And the only outcome if America wins is that some nasty people gain power and Syria becomes a total hell hole like Iraq.
The rebels seem to be remarkably well armed, and are killing a lot of civilians - where did they get there weapons? And why do you think that they aren't capable of launching gas attacks, looking at the video it looks to me like a case of load a different type of shell and fire it. Not hundreds, not dozens but 3 to 5 attacks - not really that huge is it?
Is it possible that the evidence is fabricated, yes, it's always possible, the US for example has fabricated evidence many times to go to war. Simple fact is there is evidence that the rebels launched the chemical weapons, there is not evidence that Syrian military launched the chemical weapons otherwise US news would have plastered that all over the place.