When people will vote for a pedophile to avoid putting a checkmark next to a (D), that's when you can give up faith in the average citizen's regard for the details of an election.
When people will vote to decriminalize child prostitution and felonious sexual activity to avoid putting a checkmark next to a (R), that's when you can give up faith in the average citizen's regard for the details of an election.
http://www.latimes.com/politics/essential/la-pol-ca-essentia...
https://leginfo.legislature.ca.gov/faces/billTextClient.xhtm...
both parties are atrocious, along with anyone who votes along party lines thank you very much...
but perhaps that was your point..
Regarding decriminalizing child prostitution, the bill removes penalties for the children. Anyone purchasing or attempting to purchase sex from them still face criminal charges. Many places have done the same, but also decriminalize adults who offer sex for money. This is because a very large percentage of people who engage in prostitution are forced or otherwise coerced into it. Decriminalizing their side allows them to more easily seek help while still forbidding paying people for sex.
"Felonious sexual activity" as you refer to the bill to reduce not informing people that you are HIV+ before having sex from a felony to a misdemeanor is certainly controversial, and arguments for and against the change have merit. On the one hand, there are a few people who do it maliciously, but on the other hand, there are people who are inordinately targeted for prosecution under this law (mainly prostitutes). There's also the question as to whether these types of laws continue the stigma around HIV, and what that does to people living with the disease.
So when I analyze your argument, it's extremely weak to claim that people will agree to horrible things to avoid voting for a Republican.