This is the point.
The West does not fear destabilization;
Yes, it does (not that a united entity called The West is a reality but I think I know who you mean). If it lost control in a region important to its interests, that it has heavily invested in dominating, it would be from its point of view a catastrophe.
it fears strong, hostile states.
Assad until he started killing protestors had tried to improve relations with the west, retreated and offered concessions (abroad and at home) even entering into serious negotiations with Israel. Is this what you mean by strong and hostile?
Does it? The strongest who quite often are hostile toward "The West" seem to be doing pretty well.So it destroys them.