system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5 the reasons why Al Queda attacked us on 9/11.

And please no conspiracy theories.
gpt
Two big reasons: US support of Israel and the Gulf War.

In the metaphorical neighborhood block of the Mid-East, Israel is the kid no one likes, but has a big brother that always standing by to back him up in a fight. That big brother is the United States. All the other kids in the playground end up seeing both as bullies. 

Since America gets to play the role of the "Big Bad," the Gulf War was seen not as the US breaking up a fight between a smaller kid (Kuwait) and a bigger kid (Iraq), but just as more bullying. It didn't help that everybody knew that Kuwait was a spoiled rich kid who would let the US borrow his 3DS. 

Worse they US stopped the fight by cutting through Saudi Arabia's house to get to the fight, and everyone knows that Saudi Arabia is holy ground. That's just cheating. Worse yet, the US even hung around in Saudi Arabia's house after the fight was over, occasionally jumping out to give Iraq a smack if he got out of line.

So, now all the disgruntled kids have proof that the US not only supports the weird kid no one likes, but is also a bully who will break the rules to get his way.