I'm not disputing that minorities and women have been the target of discrimination, but the question is whether the phrase "the cruelty is the point" is accurate. There are obviously times when it is, as in some of the cases you've described, but most of the time when I see someone saying "the cruelty is the point", they're referring to conservative policies on things like immigration or abortion, which have goals aside from cruelty.
I think that the phrase is often used to demonize conservatives. If the cruelty is the point, then everyone who supports the policy is knowingly cruel and malicious.