Because God is infinite Love—all-inclusive universal—He leaves no one outside, no one unloved. Many of us envision what it would be like if all mankind understood good's allness. We yearn to reach out and love mankind more, reflecting God's "great love wherewith he loved us," Eph. 2:4; as the Apostle Paul so beautifully puts it.
As a young person, I attended a Christian revival meeting where a verse sung impressed me very much:
'Tis the old time religion,
Makes me love everybody,
Makes me love everybody,
And it's good enough for me!