The issue with kicking out members is that it starts a precedent. The idea is that NATO got your back if you're in, you won't get kicked out if your membership starts being inconvenient, and that the other members will act when Article 5 is invoked.
This argument goes both ways though, I suppose. NATO has your back and you have to have NATO's back. If Hungary start dicking about then things wont go well for them, I think.
> idea is that NATO got your back if you're in, you won't get kicked out if your membership starts being inconvenient, and that the other members will act when Article 5 is invoked
None of that is violated by kicking someone out before they are attacked.