Since you speak English, you were almost certainly born in a colonised country. Yes, it can indeed go badly. And if you had thought for 10 seconds before typing your outraged reply, you can probably think of a few cases where it has gone well.
Ironically, your "solution" requires either being, or having the cooperation of, the government in the affected territory, so you're actually agreeing with me.
You seem to be using a different definition of colonization of state than what I considered nominal i.e. maintaining power structures that are closely aligned to the colonizing force or transferring people to create such power structures. Of the top my head, I can't name a single one, I can however name several botched attempts at colonization.
My "solution" doesn't require much cooperation, other than having a NGO and government tolerance of such NGO. IF NGO count as colonization than colonization is pretty meaningless.
Ironically, your "solution" requires either being, or having the cooperation of, the government in the affected territory, so you're actually agreeing with me.