Why is this sub mulch more popular than ask democrat, liberal etc?

I have noticed that in this sub the conservatives tend to answer questions with a general intent to explain.

I see a lot of silly questions that are taken seriously, out of courtesy.

The democrat and liberal subs are the exact opposite.

They are also much less courteous and polite.

Why do you think r/ ask Democrats, liberals etc are much less popular and the users are much less polite?