Because these guys don’t want the full trade off of gender roles the conservatives promote. Many conservative women expect dating with the intent of marriage and at some point having the husband be able to support a household where the wife stays home and takes care of the house and children.
Actually it is probably more secure than voting machines.
I have worked as a signature verifier for two elections in my state.
The tldr, a lot of measures are in place to make sure everything is in the open, machines and people are double checking each other to prevent machine/human error/bias, and there is a evidence trail of paper/witnesses/logs/recording.