Yellow high-vis vests for all pedestrians everywhere?

From a thread I stated on the commuting and transport section of boards.ie: The stats could be seen as to suggest pedestrians in urban areas could benefit far, far, far more from high vis than cyclists… so, why isn’t there a push in that direction?

All quotes from the RSA’s Road Collisions Facts 2007 (PDF).

First, the majority of pedestrians were killed in the hours of darkness:

Seven out of 10 pedestrians were killed in the hours of darkness.

And majority were killed inside built up areas:

Fifty-eight per cent of pedestrians were killed inside a built up area.

In actual numbers, pedestrians are massively more at risk than cyclists, and motorcyclists are also notably more at risk than cyclists:

2 in 5 of those who died on our roads in 2007 were vulnerable road users
1 in 5 were pedestrians
3 in 30 were motorcyclists
1 in 30 were pedalcyclists

Also note that 3 in 5 of those who died were not “vulnerable road users” (sic).

So, why are pedestrians not being hounded to wear high vis while walking around town?