so very true, i had a crash last year, my own fault i may add too.
i had great brakes and everything, although the tyres were legal, the grip was attrocious, old part worns on at the time, i put off buying new ones, then i crashed when i hit some damp road and locked wheels up.
first thing I've done is check and replace all worn tyres on all cars, i could have ended up much worse and really hurt someone.

sadly it does take an accident to realise the danger of a vehicle for some people.
for me it was tyre quality, as the rest of the car was spot on and i always maintain them to be 'safe'