The counter argument is that it is much harder to intercept the mail en-masse than it is to interfere with elections in person. Every year there are stories of

The counter argument is that it is much harder to intercept the mail en-masse than it is to interfere with elections in person. Every year there are stories of polling places having "technical difficulties" or being "moved at the last minute" in certain neighborhoods. Roads get closed down, signs directing people where to go to vote are not put up, and 4+ hour lines out the door become common place in areas where those in power want to suppress votes. In contrast, with vote by mail people don't have to take a day off of work, they don't have to wait out in the cold for hours, and they don't have to risk not being able to vote at all if their local polling place decided that all the machines are "no longer working".