What kind of question is that? 9/11 was an actual terrorist attack. This spill is an accident, no one wanted this event to happen. Human errors with mechanical failures, mostly likely a combination of multiple errors. You think BP wanted this to happen. Come on.
2. BP "wanted" it to happen in as far as lobbying for lax oversight,wining and dining regulators, greed in exchange for safety logistics or human welfare. Less than prepared for situations like the current one hence priorities way out of whack.
So.. when you see the reality in both situations for what they truly are - I say to you - what's the difference?