This is all a red herring, would you like to answer my question? "Why didn't God predestine all, since He's not willing that any should perish?
One answer a Calvinist does often give is that it is none of your business. Who are we to demand of God why he did thus and thus? There is some truth to that answer. The question comes up though is that even though we have to accept that that is God's right, is that how God really acts? And you are right, if by predestine, you mean determine in the way those same Calvinists mean it, as in direct causation, then you have a contradiction with the idea that God is not willing that any should perish. Thus you have the argument that you see on here that God
is willing that some perish and thus all the stuff about that was only to the elect and so on.
There are two possible answers I know of. One is that somewhere in this, there is some involvement of human free will which can at least mess up God's willingness to save. The level of drawing or conviction must be resistible or else the only other answer is that God chose not to provide a means of salvation to everyone. The level does not have to be equal in everyone - but it must be sufficient that God can determine in his wisdom that it was enough and once at that level the deciding factor is the decision of the person.
That would satisfy Arminians or Provisionists and so on.
The other answer would be from the standpoint of a true Calvinist. Men
should be able to come to Christ or repent upon hearing the gospel. If they don't they are guilty, justly. True, they are "unable" to come on their own. However; this inability is moral in nature, meaning that the bottom line is that they are unable because they are truly and willfully unwilling. The problem is their will but in a sense you are your will, at least as far as free choices go. And since they are guilty, truly, and justly so, because of their own free will choice, if God does not save all by regenerating all has he acted unjustly? The question here is not that all have sinned, but that all choose not to come to Christ by their own true free will.
The question here is can you accept this as God truly loving all, yet choosing not to give sufficient grace to all (even though they all truly deserve damnation) when it is known that these same people, though guilty as charged, are totally dependent upon such grace?
So in other words, you can have total determinism, where God saves some and wants or is willing that the others perish. You can have a system where a man can mess this up by wrong choices, and the wrong choices truly are the reason (and by definition right choices do have a part, even a deciding factor in salvation). And three, you can have a system where it is Calvinistic and much like the first except that the explanation is more fleshed out as to how man is truly, morally guilty and should be able to repent and believe but can't only because he won't. (But yet God is still totally sovereign in who will end up believing).
From that you should be able to figure out where you fit in.