Right. You're just asking questions that happen make him sound like a vicious racist.
Darwin, the PERSON, did some weird things in his life.
Apparently he married a very close relative and advocated some weird ideas.
But that's the case with every ideologue, for every accepted idea they have, there's some weird stuff. Plato is generally remembered in positive terms today, but held some weird views on women and medicine, for example. Some of the founding fathers maye have been slave-owners, but also theoretically held to some great principles. Nothing is one-sided.
Now for the reality check:
As to whether Darwin's personal eccentricity has any bearing on the "theory of evolution" as understood or professed by contemporary people, that seems unlikely. People generally see it as a science, like math, and hence don't draw any connection between the person and the idea named after or associated with him. You can be an evil person and still be a good mathematician, and hence the person doesn't matter relative to the science.
So discrediting Darwin doesn't make a difference to Darwinists.
And indeed, they don't call themselves Darwinists, it is we that refer to them as Darwinists. They accept the theory of Evolution, they don't accept Darwinism, since the person is not important to them.