Unfortunately, I'm going to just tell you there is no way to answer this question.

It requires working with counterfactuals. How can I know if Western intervention did something good, when we don't know if non-intervention would have done better? We can't, unfortunately. This is a political, not a historical question.

Further, this is way, way too broad. It's a "throughout history" question (because it focuses on 60+ years of extremely fraught history), it doesn't specify any issue to talk about, and it's generally just too wide for a real response. You should consider reasking about specific events, and what direct effects we can observe: not whether the impact is overall positive.