It's about preventing easy scaling of voting fraud. To corrupt vote counting at multiple precincts when using a paper-based, manual counting system, requires th

It's about preventing easy scaling of voting fraud. To corrupt vote counting at multiple precincts when using a paper-based, manual counting system, requires the bribing of a lot of people in different locations, and is hard to keep quiet and go unnoticed the larger it gets. Using a digital voting system, if the software or firmware of any part of the voting process is compromisable, likely no-one will be able to tell, any many precincts affected.