You're being deliberately obtuse. No one said every defender in the NBA is a good defender. Of course they aren't. But you have to be good enough that you're worth playing relative to your offense. To put it in Butler terms: Tyler Lewis was a huge negative defensively in 2017, but his offense was so valuable that it was often worth playing him anyway. Ron Nored was a terrible offensive player for much of his career, but his defense was so valuable it was worth the offensive hit. JJ Redick is not a good defender. But he's adequate enough at guarding NBA shooting guards that he's worth playing to take advantage of his 42% career three point shooting mark. Both sides of the ball matter, and it's the totality of the two that determine your value. It really isn't that complicated, and I know you know that. If you hate the NBA, that's fine, but that mostly means you don't like basketball once the players reach a certain level of skill or have a certain level of athleticism.