Good question. Do Malthusians have the "right" to have their population ideology taught as fact in public school? The state is presently enforcing that "right".
Now, some sixty plus years later, the worlds population is three times what it was then, and I would venture to say that the number of people dying from starvation and horrible diseases is substantially less today than it was then, not just as a percentage, but in pure numbers alone. And, this despite the basket case that is Africa, which is worse now than it was then.
Clearly, something has gone wrong with the Malthusian theory. By any standard gauge, the theory is a flop. As further testimony to this fact, I must report that I have yet to meet an enthusiastic Malthusian (or any of the modern variations) who is prepared to show us the way by being the first to plunge into a premature oblivion.