“A non-Jewish taxi driver assumes that all Jews consider themselves brothers and sisters! If such a person realizes that, why can’t we, the Jewish people, treat each other as such?”
We do. You need to give us credit. Even though not a single media outlet I saw pointed this out, did you notice that the crowd was a mix of Ashkenazim, Sefardim, Chareidim, Chasidim, Modern, Litvish, Daati and irreligious? In fact, despite the victims being Sefardim I would estimate that the majority by large were Ashkenazim (at the US levaya for sure – at the Israel levaya it was more of a mix). Yes, it was all a mix of everyone being one. So much so that no one even noticed it since it was so natural. No one blinked an eye or thought twice, wow what a mix, because it is so natural to think of each other as brothers and sisters. It is the imagination of outsiders that invent these non-existent barriers of imaginative separations. Of course we are all one. We know it. And we act it.