> If you don't have enough evidence to arrest somebody, how do you justify putting them on the [no fly] list in the first place?
That's a question I'd like answered. I did find out that about 280 people on the list are US residents or citizens, so that gives us some sense of the level of threat required. Many more people have the same name as someone on the list, and therefore have to go through extra hassle. The number of people on the no fly list doubled in 2012.
> That is right up there with seizing and selling off assets before you even get a conviction
If there is actual evidence then arresting them makes even more sense. The only reason to put them on a no-fly list would be if you are trying to arrest them, and just want to ensure they don't blow up a plane before you get a chance to do so.
Doing a few minutes of research, I learned that the no fly list doesn't actually stop them from flying. It's a list of people not allowed to fly INTO the US, or out of the US. It doesn't apply to domestic flights. I would say that a nation has the right to deny entry for any reason whatsoever. I don't have to justify why I don't invite someone into my house, and the US doesn't have to justify why we don't invite a certain person into the country. Not letting people leave is a little different. However, it seems that most often no-fly people are indeed arrested if they try to leave the country, so apparently there is cause for arrest - law enforcement would have preferred to wait longer before arresting them.
Based on what I've learned this morning, it seems the process needs improvement, particularly in regard to false positives, but there probably are about 280 people who really SHOULD be on that list. The other list, the terrorism watch list, is much, much larger.