For ME that is counter intuitive, but lots of things in this world are.
Lots of things in this world are, for me as well. But many things do make sense when looked at in the right way.
First off, with a bullet, it is not only pushing through the air, but also spinning rapidly on its axis. Mass, inertia, torque, and other factors are in play. Bullets are essentially pointed rods thick at the back, thinner at the front. So a tiny change that does actually unbalance the front is over-ridden by the still balanced stability of the more massive rear section.
Anything less than a perfectly balanced nose will "wobble" it's something that could be calculated, math says it must exist, but the effect of that tiny wobble is (usually) hidden /overwhelmed by other factors, so there is seldom any effect on accuracy we can see.
An "unbalanced" bullet base, on the other hand, has a great effect. It is the greatest mass of the bullet, so if the weight is lopsided (not "true" with the spin axis) the bullet won't fly true, either.
Think of a football, as a related example. The point of the ball can wobble a bit but the ball still flies straight enough, if the throwing hand applies the spin correctly to the wide middle of the ball. But, if your fingers slip as you throw, the spin is unbalanced, and the torque of the big part spinning off balance sends the pass to who knows where. The base of the bullet is the "big part" due to its mass.
clear as mud now, right?