Many singlespeed bikes *do* have brakes. Many don't, due to track heritage (where brakes really aren't necessary) and the ability *when riding fixed* to slow down using one's legs if one is "cool" enough to do so. Surprisingly few of these brakeless fixies end up as protein smears on the underside of trucks, but you would be hard-pressed to describe riding brake-less as "safer".
Also, *le sigh*. At least I tried a reasonable response though.
Dave