People have been voting by mail for decades, in the US and many other democracies. There haven't been
any incidents. And, yes, I am convinced wide-scale fraud would be almost impossible to hide: you can't pull off any fraud without, for example, many voters turning up at polling places even though they have been mailed a ballot. Or people noticing the voter rolls show them having voted when they didn't. Or whatever scheme you are using to intercept thousands of individual letters addressed to individual residences being noticed. Or sudden, unexplained changes in participation being noticed. Or many dead people somehow voting because you can't possibly stay up-to-date with all recent deaths in the community.
And, of course, the discussion isn't actually about voting-by-mail, yes-or-now? Because that has been possible for a long time and isn't going to change. The discussion is about making it easier and/or the default to protect people from communicable diseases.
The issue, then, isn't even if voting by mail allows fraud. It's if the likelihood of fraud is significantly higher when, say, 50% instead of 30% choose that option.
This is yet another blatantly obvious attempt to stack the deck in Republican's favour. It's sickening to see people pretend to care about the integrity of democracy by engaging with all these phantom debates about voter fraud, in the complete absence of any actual fraud happening (except that Republican in South Caroline, of course).
Meanwhile, real damage is done to democracy by the unrelenting attempts to selectively make it harder for people to vote. Take a look at these changes in polling locations in Milwaukee for a blatant example (the red, suburban spots are predominantly Republican locations, while the urban core leans democratic) : https://pbs.twimg.com/media/EYoIrdZXQAILKlB.jpg
