Ok well one thing you have to understand is I was 3 bloody years old during the first Gulf War. I'm not sure how old you are, but my perspective is the one I prefer and the only one I got. And here's how I would break it all down:
Bush and Iraq: 9/11 happens, Bush feels need to respond. Somehow uses 9/11 to get the general public to go along with the idea that Iraq was tied in with the terrorists, with claims of WMD (which were not found once the invasion was completed) and claiming an immediate threat to the US. He ends up getting himself into a quagmire, costing millions (billions?) of dollars and royally screwing the US financially and causing a great deal of damage to our global respectability. And all for what??
At the same time, realizing that invading Iraq is going to do absolutely nothing about the terrorism issues Bush decides to subsequently invade Afghanistan at the same time, setting up quagmire #2 (though I am of the belief that engaging in Afghanistan was/is necessary).
Obama and Libya:
Mubarak and the whole Egypt revolt happens - the US toes a fine line as Mubarak had held some US-helpful policies, but in the end knows which side the US had to support, and urges Mubarak to step down. Things are peaceful. This of course causes mass revolts and riots all throughout the same area, causing several other dictators to relinquish.
The only one (or at least the most publicized) who refuses to accept the wave of change and step down is Ghadafi, who instead adopts a "i'm taking you down with me" stance and brutally murders protestors, not once, but continuously for weeks. He announces not only will he not go quietly but he's prepared to rain blood upon anyone who is dissenting. The blood-shed is so apparent, egregious and so non-stop that the world is literally forced to take action. Obama, along with other nations, do the sensible thing and do what they can to stop Ghadafi from murdering enough people for it to reach the astronomical levels of the other dictators from the past. This is why it was an intervention.