The reason that it is possibly more likely now, is that the muslim world is more against us now, after the Iraq war, than it was before. It's a simple matter of numbers - you can't have suicide bombers without volunteers, and the Iraq situation is good advertising for that. The radical muslim clerics are having a field day. I'm not justifying that, just pointing out the situation.

The other issue is that, for all the noise being made about homeland security, the hard fact of the matter is that our borders are still quite porous, and explosives are not hard to obtain. Witness Oklahoma city, where the federal building was leveled by 5000 lbs of fertilizer soaked with diesel. Litereally anyone could go down to Pendleton Grain Growers and get 200 lbs of ammonium nitrate without anyone blinking an eye. Go over to Chevron, get yourself some diesel. Go to the indian reservation, get yourself some firecrackers and fuse. Now you've got a bomb.

In fact, one might ponder the question, why have we only been hit once in the US? I don't believe that it is because we have magically become effective in finding all the terrorists. Far more likely that there aren't that many terrorists to begin with. For which, I, for one, am grateful.