So, you can't handle that they had evidence against them, and you can't handle that they admitted it. If they filmed themselves doing it, you wouldn't be able to admit that either. They will be put on trial. Until then, they will be held. Isn't that how it works when there's a presumption of innocence? Not only that, if there truly is such a thing as, "presumption of innocence," why are alleged criminals forced to sit in jail, or come up with bail (no bail for murder) until their trials are over?
Singapore arrests man who tried to join ISIS (Reuters)