They think this is what everyone does. They publicly virtue signal that they oppose whichever bad thing so they can condemn others for doing it while secretly doing it themselves. It’s ok when they do it themselves anyway, because they are good people doing a necessary thing for good reasons. When others find out about their behavior, their reaction is to accuse harder, because they assume we are all doing that too and they are angry that we didn’t get caught yet.
We have the same thing as your prop 1 on the ballot in South Carolina. It’s already illegal at the state and federal level. It’s just on there to help get low information conservatives to the polls, since they are convinced the Democrats want to change the law to let “the illegals” vote.