Oppression as a Reproach to God
Why is it an insult to God to oppress the poor?
He that oppresseth the poor reproacheth his Maker: but he that honoureth him hath mercy on the poor.
Why is it an insult to God to oppress the poor? It is because God made them and that if you try to justify your oppression by demeaning them in any way ("the underclass" "NEETs" etc.) then you imply that it is God who has failed.
If you do not believe that each person has gifts, potential, a positive role to play then you are saying God does not know what He is doing.