What would you propose? Leaving a country alone that backstabs us and incites fanatics to attack us while pretending to be our friend?

Just look at what resources they have and what they potentially could do with it if they openly declared that the West is their enemy.

I'm quite sure that no one will allow Saudi Arabia to use its resources against the West. If they do we'll take all they have away from them.

By the way: It is absolutely legitimate to retaliate with force when you are under attack by another nation.

The problem is if you attack Saudi Arabia, most if not all Arab countries will be on the side of SA, which would start a major conflict.