Its thick in here today! Broad sweeping generalizations presented as solid fact. And not always factually based, either.
Are handguns underpowered? Sure. If you set your expectations too high. Shooting goats or cattle proves what bullets do to goats and cattle. Nothing else.
Are animals tougher than people? No. Not people sized ones, anyway. What they are is different. Animals don't know they are supposed to drop and die when shot. That's not true for most people. Its about mindset, as much as physical damage.
Study history (I know, its not "relevant" for a lot of folks), and you will find people who took multiple rifle hits and kept going. You will also find people stopped from hits that "should" not have stopped them.
In the US, we have had a good century of "training" thanks to our entertainment industry, about what people do when shot. And in the last half century, it has gotten more and more fanciful and less real. Also, we have fewer people who actually know what people do when shot, from experience.
The time it takes for a human being to shoot a cocked gun at that distance is too slow before the unarmed individual has committed himself to disarm or kill with hands or feet or body.
This is the kind of statement that irks me. I'm sure the speaker believes it, and taken at exactly face value, it is true, but the impression it makes on others is not what is being said. The "unarmed individual commits to disarm or kill", before they take any action. So, yes, that happens before the human being can shoot a cocked gun, because it is done before the decision to shoot is made. Technically true, but it gives the impression that an unarmed individual can actually do their intended act before one can fire a cocked gun, and reality has proven otherwise man, many times.
The only time an unarmed attacker can carry out an attack before a cocked gun can be fired is when the shooter has not "committed" to shooting. Given average reaction times, of course.
The real problem of handgun "failure" is due to either the reluctance on the shooter's part to pull the trigger when necessary, or from unrealistic expectations, created in large part by the fantasy world of our entertainment industry.
Comparing merely the energy of a bullet to a baseball or whatever with the same energy ignores the vital component of force focused in a given area. A "bullet proof vest" may stop a base ball, or a .357 bullet, but will not stop an icepick.
There is no magic bullet. There is no magic gun. Simply having a weapon does not make you safe. Sheer mass has advantages that do not express well in formulas. Don't base your expectations on Hollywood fantasy or the algorithm running your video game.