Life often requires choice. However, choice also implies full individual responsibility for the effects of that choice. I believe this is the sticking point to which Pro-Life supporters react most strongly. Pro-Life supporters tend to see pregnancy as a choiceless event. They oppose family planning, contraception and sex education for minors. This is plainly irresponsible and childish in an age of overpopulation and environmental degradation of the planet.
To insist that an irresponsible pregnancy and subsequent birth is an unquestionable human right is both irresponsible and, for the planet, unsustainable. Generally, a teen pregnancy is an irresponsible pregnancy. A pregnancy in any woman who does not have the means to fully feed and educate the product of that pregnancy until it is an independent adult is an irresponsible pregnancy.
There will come a time when these simple concepts will drastically limit personal freedoms for everyone on the planet because of the strident irresponsibility of segments of the population.