That's a bunch of horse feces. I'm a conservative Libertarian but I damn well support the Republicans in my races and have never advocated voting 3rd party unless the Republican is a total liberal. I'm sure that other Libertarians do as well.
I'm glad to hear that you are reasonable and I am sure many are.
I can also assure you that all are not like you and every election there are teens of libertarians talking about someone not being conservative enough (or pure) and about voting down a hole for the third party candidate due to principles. (Just like Ross Perot with Bush and Clinton, which got us Clinton.)
I HOPE there is more thinking going on this election. People should learn form Perot IMO.