It isn't trivially easy to debunk that colonialism made the West rich. If you make everyone else poor, that's the same as making yourself rich. However, that's not how you're supposed to make yourself rich, and that'll hurt you too since there's less you can get from everyone else in exchange for your wealth.

This is turning into such a pissing contest. No one here knows enough about what other people know about to actually debate it. It's like watching people trying to play football, but the teams are in two different fields.