They presume they're the strongest.
Sasuke negs the WHOLE clan through a portal from his new castle & dimension.
Stupid faps can't be strongest while the one full-fledged Uchiha is an inter dimensional Rinnesharingan wielding God. While 1arm nerfedlmao
Hiashi could have defeated Pain if he was in the village. That is why Kishi kept him away of the village.
And he is just one of all the clan.