I have a friend who works in the security sector. He always plays Red Team - so let's call him Reddy. His job is to look at systems, understand them, and then dream up ways to exploit and compromise them.
I recently asked for his opinion on the SAVE Act. No surprise, like the overwhelming majority of Americans, he is all for it - but his reasoning was less about preventing individual illegal aliens from voting but about reversing a deliberate systemic compromise of election system integrity by Democrats over the last two decades.
Reddy thinks Blue State voting systems are deliberately designed to enable fraud on an industrial scale, and California's electoral system is the model at or near full maturity.
He contends (and I agree with his analysis) that Democrats in California and their allied NGOs have successfully built up a huge bank of false registrations and jiggered their ballot handling and counting rules so they can always "find" enough votes on election night, or even after, (when they know the margins) to make sure they never lose.