I want players who sign for Manchester United with the intention of seeing out their careers at United. I would never criticise a great player who has given their all to the club, leaving at the end of their career when it's clear they may no longer be sure of a starting place, as was the case for Vidic and Evra.
I'm not sure if you're being deliberately childish because I reckon that much was pretty clear.
As for Ronaldo and De Gea, I could live without them if they're not fully committed to the club. There will always be other good players.