[lockeliberty]

The point is the Lord is said to have bought these false teachers who deny Him.

It would seem obvious that these false prophets and teachers professed to know Jesus and thus should have been bought by Jesus but because of their heresy it would bring destruction. I'm not sure this verse tells us the propitation extends to all. This verse by itself is confusing without the near context.

[P-Marlowe]

It seems to me that to deny that the Lord bought you on the cross, even if you were not an "elect", would be a heresy. (Perhaps even a damnable one, eh?) Indeed to deny that Christ's atonement was for the sins of the whole world, would be a denial of the ultimate power of the atonement.

1Jo 2:2 And he is the propitiation for our sins: and not for ours only, but also for the sins of the whole world.