Makes no difference why they are stupid but simply that they are. After all they falsely claim that they alone have the truth. There is no reason to cut them any slack for such ignorance. They are also cruel to others and glad about it. This goes well beyond just stupid. Sure there are other ways to describe them that are more descriptive and accurate. I am just being nice.
No Joseph, you're being naive. You say Jehovah's Witnesses are 'simply stupid' and that it makes no difference why that might be. Bullshit. You make the outrageous claim that Jehovah's Witnesses are "cruel to others and glad about it". Libelous bullshit.
Pull your head out of your arse so that your brain might get a much needed dose of oxygen. If you're still angry at the realisation of how much you were duped then join the club, we're both members.
Direct your vitriol to where it really belongs - you surely don't need me to tell you where that is?