First, you are mistaken no one has taken action before now. The UN has been actively involved since the civil war broke out. See Resolutions 2042, 2043, and 2059.
See also:
Kofi Annan peace envoy for Syria
US-Russia peace proposal on Syria
39th G8 summit (the summit was dominated by discussions about Syria)
Geneva II Middle East peace conference (Peace conference for Syrian civil war)
Second, the chemical weapons attack escalated the situation for this reason:
Chemical Weapons Convention
First during the entire time you say the U.N. was involved in Syria the fighting continued and people continued to die so that is not really taking action second if the use of chemical weapons escalated the situation why is the action that we are supposedly going to take going to be very limited and short term? Does anyone really think short term limited military strikes will deter Assad?
What would you consider to be effective action other than an invasion to accomplish regime change?
You could have armed and supported the rebels when the uprising first started before the radical Islam elements came in
The hypocritical Right has blocked the US from taking any other action than diplomatic ones. They resist every effort at no-fly zones, and now they resist a missile attack. All the faux doves on the Right want to do is talk.
Unlike Libya Syria has a very extensive and effective anti aircraft defense system so that makes establishing a no fly zone questionable at best.As has been pointed out a missile attack will be limited and short term I will ask again anyone think that will deter Assad?
Hypocrites. They could not WAIT to invade Syria's patron, Iran, while Bush was around, though. Two wars weren't enough for them.
No one has ever suggested invading Iran.
Their bogus bullshit is completely transparent.