In case anyone wants some facts instead of this breathless paranoia: https://www.abc15.com/news/crime/ca-man-arrested-in-scottsdale-after-postal-inspectors-catch-him-stealing-mail-election-ballots
The man in question was stealing all the mail, and specifically targeting checks being mailed and cashing them. He wasn't targeting ballots. That was a side-effect of the time of year. He had stopped up the public mail box so anything deposited wouldn't fall down into the bin. He would then pull the mail out later on.
Ballot harvesting is generally illegal in Arizona, with specific exceptions for family members and caregivers. The state has strict laws against collecting ballots from others, which can lead to felony charges.