Because the death of 3000 civilians is negligible compared to the amount of innocents the US military kills every year.
The ideology is the same. It's not about integrity of the deed, but the outcome.
Poor people have less money, that is all. One's worth should not be determined by their monetary wealth. Money does(should) not define a man's value.
Really, the reason people don't get enough is because they can't get jobs. The reason the don't get jobs is probably because they didn't knuckle down and do as they are told at school, therefore didn't get the score they needed to go on to uni and get a degree so they could get a decent income. So, really, poor people are just individuals who do what they want with their life, while the rich are obedient slaves to the corporate run system. For some reason, obedience seems to grant jobs and money and wealth; while the opposite leads to poverty.