Is it really? treasonous by what extent? They didn’t fight the Muslims, they waited for the Quraysh to make their move, which never happened because even the Qurayza didn’t trust the Quraysh. So why the harsh punishment? Talibans are pretty much doing the same thing, you condemn them because let’s be honest, you have morals and you see the situation pretty clear. Replace Muhammad SAW with any other leader, you will instantly see how this was a horrible man slaughter in the name of God.
Anyways, let me ask this again. Do you condone what happened? Is this act of violence only justified for you because Muhammad supervised it?
P.S. I would rather hear you tell me that you don’t believe this even took place than tell me that you believe it happened and you condone it.