Originally Posted by
asdf
Because everyone in society is in agreement that murder is harmful and destructive to the community.
Gay and lesbian people do no such harm, as same-sex relationships are between consenting adults, and there is no compelling non-religious reason to outlaw it.
In last November's US elections, 5 or 6 states (IIRC) had some sort of anti-abortion bill on the ballot, all supported by the "pro-life" movement. There were also one or two states with ballot initiatives removing/restricting rights for gay and lesbian people (most famously, Proposition 8 in California removing marriage rights, but I believe there was also an initiative about adoption rights).
Pro-life groups, religions, and charities - most significantly the Mormon and Catholic churches - spent a m***ively disproportionate amount of money opposing Proposition 8 as they did on any of the abortion bills.
I think the question is, for those groups who ostensibly see abortion as the unjust taking of a life, why should removing the rights of gay and lesbian people be seen as more important, more significant, more deserving of spending "pro-life" dollars?