And why aren't Republicans held to this standard? Plenty of pro-death Republicans. Why hold Libertarians to a higher standard?
Who said Republicans aren't held to that standard? READ the Republican platform. IT'S agenda is to protect the unborn. No if, ands, or buts. The pro-abortion Republicans rant and rave about this every year, and try to get rid of it, but they don't have enough power or influence in the party to do so.
Now go read the LP platform.
When the MAJORITY of Libertarians support pro-life issues like the MAJORITY of Republicans do, then we'll talk.
Pro-lifers asking the LP to adopt the SAME stance as the GOP on this issue is not a "double standard". Quite the opposite, actually.