It’s much harder for fraud to work when the election isn’t close in the first place.
I used to think that too, but 2020 proved me wrong. Trump won by a landslide, and yet the fraud made Xi Dung the winner by a hair in the key states and hence the country. The deep state proved that even blowout elections can be stolen.
People keep saying that the election reform legislation that is being passed into law in the various states is going to fix the problem. That doesn't take into account that every last one of those laws is going to be challenged in the courts, and the crooked and/or cowardly judges will strike many of them down.
PA had a voter ID law in place prior to the 2012 election, but the courts put it on hold until after the election, and it was eventually struck down as unconstitutional in 2014.