With 7 tailed beasts captured, why did Obito not capture Naruto here and help Kisame capture Bee?

Doubt it

He massacred women and children in the uchiha genocide but stans gloss over that yet flame itachi for it. Obito chose to kill , itachi was forced to

This. His wanting Naruto to stop him is what causes his self doubt. It's a huge plotline during the war arc that he sees himself in Naruto, and he wants him to break for the validation that he's not wrong and that this is the only path forward for him.

My guess is because obito is one of those classic villains that wants someone to stop him. He’s a tortured soul and is clearly doing wrong, but the last bit of good in him wants to be stopped. So he feeds the fire in Naruto and sasuke both.

This is actually guessed by Kakashi in the manga too.