How do you know this? Is this speculation or logical deduction?
>"If they thought abortion were murder, why are they also against contraceptive use?"
This doesn't represent all pro-life people. This mainly represents Catholics. Being anti-contraceptive is, I believe, an effective strategy for the Catholic Church to produce more Catholics.
>"Over a quarter of all pregnancies end in miscarriage - far more than the number of voluntary abortions - why are they doing nothing to reduce that number? "
Miscarriages are often spontaneous and there is little that can actually be done to save the pregnancy. Additionally, there is a categorical difference between a death due to natural causes and a death due to wilful intervention.
>"And if abortion is murder, why make an exception for rape or incest?"
You're on to something. Plenty of pro-life people take the stance that even these exceptions should not be allowed.
This kind of sentiment is overly reductive and misses the point. No proponent of small government wants a government so ineffective that it cannot have laws against murder. I personally don't believe abortion is murder, but many people do, and they're not so libertarian as to "live and let live" on such a topic. I wanted to chime in because I really dislike the fallacy of 'you claim to like personal freedom and small government, but you want the government to enforce laws you support? Curious...'