@Hurlshot Trump has the executive power, the judges just stole it from him, has nothing to do with who is more knowledgeable. The judges are not objective, it's been obvious for a long time that liberal judges simply decide for whatever they'd like the outcome to be, the hell with the law. Was just about to post this anyway, explains one reason why this decision is so stupid and dangerous: https://www.washingtonpost.com/news/volokh-conspiracy/wp/2017/02/09/the-9th-circuits-dangerous-and-unprecedented-use-of-campaign-statements-to-block-presidential-policy/?utm_term=.3ed5dd6ad286
Edit:
They don't have to justify it, we have separation of powers, the President doesn't need to have his decisions approved by the court. All the court can rule on is whether the order is legal or not, there's no requirement anywhere for the President to prove that there's a real threat.