No you are innocent until proved guilty, suspicion is not guilt.
No but suspicion will get you held until they can be sure, and when talking terrorism that is very important.
It's one thing to let the drug dealer go a little farther to make sure you have all the proof you need. But if you use that same logic with a possible terrorist, hundreds or even thousands of people may die. Here you need to err on the safe side.
Was the man from Brazil innocent. He very well may have been. But his actions that day raised suspicion, and in light of the events from the previous day, the police could not take a chance.
Terrorism works when their acts of terrorism worry people. The people then ask for more protection, which can lead to innocent people being hurt or killed, and more stringent laws being passed. It's at times like this, that people like you proclaim the government is wrong, which helps to weaken the citizens faith it their government and causes them to question actions that are taken, which weakens the government even more.
Terrorism won't sweep into the UK the way the German army tried. Their goal is to take down the western culture from within. We don't need to give up all our rights to stay safe, but the constant complaints from some about the way the war on terror is being fought only strengthens the other side. They pay close attention to all those that complain about our elected officials, and police. This evening I watched some of an interview with the Pres of Iran. He is fully aware of Pres Bush's approval ratings, and I'm sure sees this as a sign he has a chance to get his nuke.