

Pretty much every modern election system tabulates the ballots electronically, but keeps around the paper ballots for random recounts or investigations. The only reason not to have the paper involved is if you’re cheap / incompetent / don’t care about election security, or if you specifically want to steal the election.
And after that, citizens of the US. This all has nothing to do with deportation, it just happens that starting with the “other” is convenient because it lulls US people into thinking it won’t happen to them. The fact that ICE was already full-on into Gestapo tactics made things a little smoother, too.