A bloody pentagram is not good art. It’s juvenile, and frankly cringeworthy. The famous “Twinkie” bust [1], maybe. Baby dolls in red paint is just silliness.
I take no particular stance on your examples of what constitutes good or bad art. I agree: bloody pentagram? Cringeworthy.
What I vehemently disagree with is this assertion:
>the false notion that art should be provocative not pretty.
Why should art be pretty? Why "should" art be anything specific? I would even go further to say that to require art to have (nearly?) any specific quality is the antithesis of art.
