"Terrorists should be dealt with through our criminal justice system, including the presumption of innocence. If someone is a terrorist, I would be upset and want them to be prosecuted, but we don't need to call them names to do that."
All you are really doing is stating that criminals are not terrorists. The entire thread is arguing that the person in question is not a terrorist.
The thing everyone is ignoring here is that what you call someone is irrelevant. I could call you a terrorist, and it won't matter at all. It's just my personal statement and opinion. All that matter is the consequences.
What are the actual consequences of being added to the "terrorist watch list?" What I've always thought is that it means you cannot fly. Is there some other consequence?
Consider how angry you are reacting to me; then consider how angry you would be if someone zeroed out your bank account by hacking. Do you still think people who engage in malicious hacking should be allowed to do what they do without being added to some lists of people who should be dealt with?