From what I can tell, the average Christian these days maintains that God does not send anyone to a firey torment, we choose of our own free will to reject God therefore we reap the only alternative available. So it isn't so much that God is seeking unbelievers out, it is a consequence of not accepting Christ as Savior during our earthly lifetime.
The argument for hitler could be made, however, I have heard the reasoning from Christians for that exact questioning and it is basically since God is sovereign, he can do whatever he wants because he defines truth. Hitler could not have been doing the same thing as God because hitler being human does not have the authority to make that judgement for those specific people. God may destroy certain people, but God is the one that gets to decide that. Even Fred Phelps does not believe he should be the vessle to destroy homosexuals but he does believe he is called to warn the world of Gods wrath against the things he says God hates.
Now, where I do see the similarity is that Christians whether they believe God sends people to Hell forever or whether we choose of our own freewill to reject God and end up there, they believe that if God created that consequense for the crime, then we cannot question Gods judgement in a manner that changes anything.
In respect to logic, the latter there is a logical position. If indeed God has set up an eternal place of punishment, then what are we to do about it?