> In those two decades there have been hardly a hand-full of convictions for mail fraud related to ballots that entire time, with millions of mail-in-ballots cast. And there are no indications or notions of any subversive fraud.

But that's the objection. Mail in voting is problematic because the fraud is so hard to detect.

Suppose someone obtains and submits a bunch of mail in ballots. Ballots of people who don't normally vote etc. How would they even get caught? "We haven't caught very many of them" is the problem.

> The only reason to oppose mail in voting, much like supporting rejiggering districts (gerrymandering), is to rig the vote.

You could say it's to prevent someone else from rigging the vote.

Also, this:

https://fivethirtyeight.com/features/there-is-no-evidence-th...

So if it doesn't really affect the balance of legitimate ballots and only makes fraud more difficult, why would somebody be against it unless they're legitimately concerned about fraud?