I’ve never quite understood how economic conservatives deal with the cognitive dissidence of supporting abstinence-only education. Aside from being a wasteful use of tax money, the position runs counter to what makes free markets work; individual choice and information. Abstinence only education is on the wrong side of the equation; limiting choice and reducing available information. Why should anyone be surprised it is less effective at producing good outcomes?
Doubt's Blog 
Because every political party is actually a loose confederation of movements which may or may not be related, but which are calculated to add up to a large vote total. I’m sure careful scrutiny of the Democrats would reveal similar sets of discordant groups under the same umbrella.