Christianity pretends to believe that God lets Hitlers etc come for he has to avoid interfering with free will
Christianity says that we must have the power to choose evil or good. But it
does not really believe it. Christianity says that we are all sinners meaning
that we do not have the free will to live a sinless life. So we only have choice
in relation to what sins we want to commit. We have no choice about being
sinners or not. This implies that God doesn't give us enough free will. A God
who refuses to give you the power to live a sinless life but you gives you rein
to commit whatever evil you wish after making sure you will sin is a God of
evil. The freedom to live a sinless life is not as important to him as making
people inclined to commit any sin even extreme ones. The worship of God is the
worship of evil.
If God wanted us to have a lot of free will he would have given us the power to
live without sin.
He lets us have a bias towards sin that we will give in to and then lets us
become Hitlers if we can. So he gives us too much free will of the wrong kind.
The free will argument that evil is compatible with God's love is wrong. To
worship God is to close our eyes and hearts to his evil.