I just looked this up earlier, and there are only 2 states that do. Vermont and Maine allow all prisoners to vote. Other states allow some depending on conviction. I was unaware of this. I was aware some states allow felons to vote once released while other states never reinstate that right. That is some heinous shit. No other way to put it

Absolutely. And in prison it should be easier to verify that they vote just once

This is like requiring a stranger that attempted to break into your house be forcibly allowed on your property later against your wishes (assuming you rationally consider such a person untrustworthy and no mitigating circumstances or other data exists that would make you consider them trustworthy)

It's not like that at all! There's no right to enter a stranger's house in the first place.