Those opportunities aren't because they're mentally inferior, they're because we as a racist country have intentionally put them behind. From slavery to Jim Crow to redlining, we have slanted things against minorities. It isn't the minorities fault they need help, it's ours as we did it to them.
None of which is anything like you assuming Black people are the only unique race so stupid to vote against their own interests en masse. No other race votes monolithically like Black people, you have to assume they're uniquely monolithically stupid.