malach, I agree with much of what you discussed.
You implied election workers are not professionals. Maybe some of the supervisors know a lot about what constitutes fraud, but maybe they are not hired for competence. They got hired because they have degree or for political reasons. Whatever. This is the careless manner in which government is run.
And the failure of law enforcement and the lack of will in the people to see bad actors get punished is another cause of the problem.
On the subject of blockchain, I’ll note that having an uneraseable record of transactions is an advantage, but the lack of any trusted authority behind crypto-currency is a license for criminals to attack.
https://krebsonsecurity.com/2018/08/alleged-sim-swapper-arrested-in-california/
Story above: a law enforcement task force in Silicon Valley tried to track down criminals who were making a fortune targeting people who attend conferences and talk on-line about the merits of crypto-currency.