People are arguing why spiderpeople helped Miguel to stop miles
Obviously, the ones that weren't in the room only heard his request to stop him and didn't know why.
And the ones in the room did it for their own peace of mind.
Because they had their important police captain killed, and felt so much GUILT for not saving him. But then came spider society and they learned everyone has to experience it. The death wasn't their fault, that was the LORE
And then comes Miles, that already broke the lore and the universe didn't collapse because of it. And he wants to do it again. And if he succeeds, then the guilt will come back. Because it means they COULD stop it. When they thought it was unavoidable and made peace with it.
If Miles' dad dies, then it was the lore. If Miles saves him, it was ON THEM