I would correct it but in all fairness I first have to admit that some, maybe most Calvinists, believe it exactly as you have charged so I cannot defend them and won't try. But let me just say this:
This does get back to determinism and to the question of if determinism is true then is it necessary that God created evil. And what would it mean "to create evil". The Calvinist confessions say God does not make anyone do evil. And there is plenty of metaphysical wrangling on this but basically the answer I see most, from Calvinists who are willing to do more than recite a line from a confession, is an answer that should please free willers. Here it is.
It is not necessary that God actually create evil, only that he create separate beings capable of evil. (men and angels, for example). He can
give them freedom to do evil and thus be the originators of evil without God causing it himself. And, with some combination of foreknowledge
by allowing this to take place it can be said that it was decreed and yet not "caused" by God. Of course it can be said, and this is a major
argument for atheism, that if God just knew what finite creatures would do in a set of circumstances, and did not "fix" that, then he is
sharing in their guilt. Many free willers use that and I warn them they are headed down a path toward atheism.
Now the above still doesn't answer the question of our depraved and malevolent free will that Calvinism claims. Here is where the theology of what the fall means and the nature of man comes in. Wouldn't the free will of each person coming into the world still be neutral towards things of God? Calvinists say that our human nature was designed for fellowship and dependence upon God. The Fall broke this, and without this we are incomplete, malformed images of what we should be. Thus almost all Christianity, not just Calvinism, puts some premium upon God's grace as essential to even our coming to Christ. As for angels who rebelled, no information is given. They are of different substance than us and Calvinists note - have no provision made for repentance.
So. In short the answer is that man does not have to be created directly with an inability to come. But without God's grace man is incomplete, subject to sin and death, easily deceived, self absorbed and everything else that we know to be true about ourselves. And, for all the free willers, there is a true sense in that when you see that, keep in mind that you are actually observing the results of God respecting our free wills and allowing it to be completely independent of God and proceed to it's logical endpoint. So, while I do think Calvinism, as a theology, when every single point is considered, may have some problems, it is a formidable theology when explained fully and no one need run from it's claims.