What exactly can they do to those who vote to overturn?
"If anything in this life is certain, if history has taught us anything, it is that you can kill anyone." - Michael Corleone
The disloyal opposition has already succeeded once; it would not be beyond them to assassinate two or three more, whatever is necessary to revert the overturning.
Remember, in this world nothing is ever settled until it is settled the way the left wants it settled. Overturning Roe is simply an impediment to the fulfillment of their agenda, as far as they are concerned.