"why dont (you) fight for human rights like slavery on children?'

Fortunately, the self righteous 'do gooders' finally succeeded in the US despite, as Richard Dawkins observed 'lots of people felt morally uneasy about slavery but went along with it because the whole economy of the South depended upon slavery.'

and the view held by some in the north that
"There is no right, and ought to be no inclination in the people of the free States to enter into the slave States, and interfere with the question of slavery at all."

Please excuse my lack of consideration for the feelings of the poor benighted slave owners of the past or those who control traffiked people in this day and age which you can bet your bottom dollar I'm 'agin' !