I understood everything in your last post. My point is that Republican presidents gave us those justices regardless of the circumstances of those appointments. They were not helpless victims of those circumstances; knowing the consequences of making such lifetime appointments they did it anyway and with the happy exception of Thomas and Scalia (most of the time) it has been a disaster, in my opinion. I will not let the Democrats of the hook for their awful appointments either (Ginsburg, Breyer etc.) but I expect more from a Republican party that claims to be something it frequently is not. The Democrats are out-and-out Communists but they don't pretend to be anything else. They just committ their various outrages and dare the GOP to do anything about it. More often than not, the Republicans don't.
What do you think a libertarian President (fat chance) would do with a Supreme Court appointment if the Senate was controlled by the Democrats, and they simply weren't going to accept anyone who had libertarian views? Keep on appointing people and having them rejected, presumably till his term in office ends? Hold his breath till he turns blue? Reagan appointed Kennedy, who you apparently think is no good, for instance, after Robert Bork was rejected by the Senate. And don't give a BS answer like "A Libertarian President wouldn't have the Democrats in control of the Senate". I know that's the kind of answer you'd like to give.