As I posted be fore after years of time travelers and dimension hoppers Kitty, Bishop, Rachael, Cable, the FF, Kang, Doom, Iron, Man, Dagger and who knows how many others IDK there was reason to suspect one more time travel trip was going to do any more harm.
It was more than speculation Storm said flat out she was trying to stop it. Does not take much to see she could only do it for so long.
And I repeat for the slower among us that my original statement was there was no plan of personal gain by Beast. He was trying to help Scott. You don't have to agree with the actions or like the outcome but it is right there on the page what he is trying to do. It was for someone else not himself.