How is it wrong. How can you prevent me from selling my vote if I vote by mail? How can you prevent an abusive spouse or parent from stealing my vote? How can you prevent a local thug from coming around to collect my vote, making sure I voted for his preferred candidate, and then mailing the envelope himself.
The answer is you cannot prevent any of those things. For any of that, you need a secure location.
Extending voting past Tuesday is the solution to that problem, not remote voting.
Despite your claim to the contrary, there is very little documented evidence that in-person voting fraud is significant. This is not an accident - this is due to years of adjustments and fine-tuning of in-person voting procedures. Look at Chicago for historical examples of how badly it used to go. Unlike in-person voting, remote voting can never guarantee the anonymous vote. Every election is inherently at risk when more than a handful of people use remote voting.
At the end of the day, a technical analysis does not matter. The idea of remote voting is fundamentally flawed, as it fails to guarantee an anonymous vote. It does nothing to prevent vote buying, proxy voting by an abusive relative, stealing of votes (for instance, at a retirement home), voter intimidation, etc. A secure voting location is absolutely vital to a fair election. Even absentee ballots need to be minimized - we recently had a tainted election in NC thanks to those.
OK, we're talking about big numbers in aggregate. Edge cases don't really matter. Lots of people are gifted $200 Androids, too. iPod sales got so low compared to iPhone sales that Apple stopped reporting them.
Term, holidays, term, holidays, till we leave school, and then work, work, work till we die. -- C.S. Lewis