The pillars of Secular Humanism dictate that man is inherently GOOD, and that man IS a God, or collectively God. Thereby everyone is nice, or at least potentially so, and everyone has an element of goodness in them. Adolph Hitler probably just needed some anger management and a good talking to, and he would have got over this mania about murdering innocent Jews. There was just a nice guy in there somewhere! He was like every other Soccer Dad in Europe, but maybe a little more edgy.
This kind of thinking is pagan, and anti-Christ, and without knowledge of original sin, there can be no repentance nor faith toward God, for the Word says that man is deceitful and exceedingly corrupt, and doomed to desperate wickedness. If we are but "Nice", there is no conviction of SIN, or awareness of our satanic natures, or "self lives". This is at the core of Jesus' bloody sacrifice of Himself, as by mercy He made the way for us to be born again, which is at the crux of the holy universe itself, [ the one that will endure forever and ever, set apart from the lake of fire ] and at the pinnacle of all creation.
Those that remain "nice" have attempted to circumvent that one command to repent and Believe upon the Lord Jesus to be cleansed, and cling to a system of their own justification, be it religious or civil. In the end, only the redeemed and forgiven enter Heaven, and those who rest upon there NICETIES must be cast to Hell, otherwise Heaven would not be Heaven.
[b]"Marvel not when I say to you, that you must be born again!"[/b]...Jesus of Nazareth.