You should have a strong moral compass, and you should be able to tell right from wrong, and awful from decent. And you should let that compass guide you in everything you do, including who you give the precious resource that is your attention to.
Framing it as "other people consider awful" makes it sound like you do not actually agree that awful people are all that bad, and that is a moral failing on your part.
Everybody has done and said awful things. If you don't want to read the works of sinners, then you won't be able to learn from anyone.
My example highlighted folks like Thomas Jefferson and George Washington, unrepentant slaveholders who happen to be keystones of American democracy. They said and did awful things in life. Do you think therefore that you have nothing to learn from them?
Your logic is exactly the reason many people tell us we shouldn't bother learning too much about, say, the founders of American democracy.