Your saying "need" is a mis-statement.
I say "choose".
Your personal feelings don't address which is safer.
Edit....
This was in the news today.
Cyclist attacks driver with massive 'zombie killer' knife in broad daylight in south London street
Nah, that's just a friendly greeting - Crocodile Dundee style. I feel the cyclist's rage though - too much aggression by so many car drivers in our cities. Not that I cycle any more.