Because it's an important distinction. OP is using "voter fraud" to refer to voters acting fraudulently, and "election fraud" to refer to election officials acting fraudulently. Of particular importance here is that the former is relatively rare (despite scaremongering by one side of the political spectrum) while the latter is decidedly less so.

Also, legally, neither one is treason.

I'm sure you read the article being discussed in this subthread (https://www.brennancenter.org/analysis/debunking-voter-fraud...) -- it makes the same distinction.

> (b) treason

I think you need to look up the legal definition of treason as specified by Article 3, Section 3 of the US Constitution.

Paper ballots with a public count work quite well. A number of countries have discontinues use of electronic voting in the last decade or so due to issues like this, and/or the fear of such issues.

As is pretty clear from the linked Vox article, the proposed solutions for largely nonexistent voter fraud would have zero impact on this sort of election fraud.

Nice try, Mr. von Spakovsky.