This entire "paradox" is hateful people trying to use your morality against you to twist your arm. Hateful people know that good people get hung up on matters of moral purity.

This always felt more like a cheap "gotcha" than a paradox for that reason.

Good people of sound mind are equipped to use their judgment to assess human social situations on an individual basis.

Good is not a synonym for Nice. Sometimes societal shunning or even force is necessary to keep hateful people from feeling emboldened to prey on others using a facade of a belief system. Some people see the world through the lens of power not philosophy or discourse.

Indulging tainted ideologies with tolerance exposes vulnerable people to it and gives the impression those ideologies have merit.

Tolerance seemingly translates to pacifism to some people and it is a fine line between being a pacifist and a bystander.

Sometimes just some well phrased vicious mockery from a knowledgable person is enough to make a point and keep in mind more often than not the purpose of that is not to convince the hateful to change but rather to sway the audience. It depends on the scope of the situation in question and a measured response is the answer.

How do we decide what is a tainted ideology? Ultimately as a group. This is where society leans on the enlightened to make these calls and extract nuance and truth from grey situations.

If we don't trust the scholars of humanity to sort this out as a group we will get nowhere fast. While this system isn't perfect I think it is evident that human morality is evolving in a good way over time when we look at the viewpoints that influence younger generations as a whole.