Writing Arabic left handed is not allowed - as the hand is considered dirty.

I use a fountain pen for writing and don't smudge the ink - nor do I 'hook' when writing.

My grandmother was educated by nuns and was punished for using her left hand - the damage to her knuckles was always noticeable as she used her left hand all the time.

I think that the Great War changed attitudes to handedness - there were so many injured men that just having a useable hand was enough.