Don't let other internet people get you so riled and resentful. Not a good luck and even less helpful with whatever point you want to make.
Klay is not the best 2 guard in the Playoffs. He, Curry, nor Durant could invidually shoulder the burden of what Harden had to for several seasons.
Harden is better (if you still consider him a two--I consider him a point guard ever since D'Antoni's arrival), but let's also consider that Thompson is playing very good defense on Leonard or whomever he's assigned to. He's not taking the Leonard assignment full-time (Iguodala gets Leonard more often) but he's actually limiting Leonard quite a bit when on him and doing a great job on Lowry, or anyone he gets switched onto, otherwise. He's playing a defensive role that Harden really wouldn't be able to (and Thompson obviously couldn't carry Harden's offensive role).
Na Harden could and has. He might have been warn out and disinterested considering some issues with his own teammates..