I have no explanation for the courtesy and generosity of another site of professional and technical competence, visited almost entirely by Americans, where there is none of the rude and boorish behaviour exhibited here. Is it because flying and building aircraft brings out the best in us and guns our weakness? How to account for the dignified and decent Americans who I've met and worked with face-to-face all over America for 60 years and the spite and spleen that spills over us here? Beats me.