This is the first time I have ever heard of a hollow point round or "dum dum" termed as "safety". The damage they do in a human body is horrendous. The entry wound is nice and neat but the exit wound is unbelievable. In 1899 the Hague Convention outlawed their use in warfare and now they are "safety ammo"??? Unbelievable.
Hollow points and "dum-dum" rounds are not the same thing. Nor are hollow points "safety ammo" except in one arcane sense that I'll point out shortly. And in some ways, hollow pointed ammo can be more humane than round nosed ammo.
How can they be more humane? Because the perpetrator is much more likely to fall down from the first round, or at least fewer rounds, and require less "perforation" to achieve the same effect. The immediate wound cavity is significantly greater (which is why it takes fewer rounds to "stop"), but not "horrendous" unless you're talking about rifle velocity rounds as opposed to handgun rounds.
Moreover, the hollow point round is much more likely to stop within the body of the intended target, and that's the most important point. A solid-point round, even in small caliber, is nearly certain to penetrate the intended target and go on to strike something or someone else.
Presuming there is a genuine legal need to shoot in the first place, the hollow point bullet is safer for everyone on the scene.
Dum-dum bullets are intended to fragment into several pieces, which is
not the case with hollow pointed bullets. A hollow-point is designed to expand but remain one piece...fragmenting actually reduces the effectiveness of the bullet and is the fault of a poor hollow-point design.
An actual "safety" round is designed to be non-penetrating. They are usually of very soft material or composition that is either completely frangible (shatters on skin impact with little, if any, penetration), or rapidly expands on impact to a size and shape that won't penetrate to any significant extent.
Rubber bullets, btw, are not "safety rounds" because a direct hit with a rubber bullet will substantially penetrate a human body. Rubber bullets are designed to be fired into the pavement in front of the target and create spalling that discourages the target.