Here's the simple math... and you can look this stuff up too.
When you ride any kind of bike that only has a rear brake (and can skid) you can pull off a .33 g stop.
With a front brake you can pull off a .6 g stop.
Actually...you can pull off .66 g's but this is the point where you usually get ejected from the bike.
Nothing can stop you faster than a well applied front brake... unless you slam into something... like a car.
Any questions ?
So... I don't care if you ride with or without brakes as that brake-less fixed gear can stop as fast as my old coaster bike (and I ride that everywhere).
I understand and accept the risks of riding a bike that has an antiquated braking system and ride accordingly... which is usually much slower than usual.
Do not presume to think or tell people that you can stop faster without a front brake... because you can't.
Don't tell people that the words "fixed gear" and "brakes" are mutually exclusive.
Don't tell other people they shouldn't run a brake (for whatever reasons)... because that is irresponsible.