> unless you view dead people or those who have moved out of the voting jurisdiction on the voting rolls as legitimate voters

Unless the purge is over-enthusiastic, with unrealistically high barriers to re-entry. It’s not a problem for someone who has all the documents and the time to jump through all the hoops (or someone to do it for them), and a sympathetic administration with an office close enough that you can go there without taking a day off. Assuming you have days off at all. It’s quite harder otherwise. The result is a disproportionally large fraction of “undesirables” (poor and living in specific areas) being disenfranchised.