My dad's argument is "But it's CAPITAL who ASSIGNS governments!". So I guess capitalism bad because there can be more rich people assigning/influencing governments and then helping cronies to capitalise more, etc. etc.

This is a tragic use of a Venn diagram. The things you're comparing do not have an obvious relationship to one another. i.e. Crony capitalism does not seem to be a feature these two concepts have in common.