Such people are considered weak by the others and therefore taken advantage of. Such bad people will definitely suffer for their behaviour. But one must not pay too much attention for this behaviour. Always keep good intentions for others, radiate love all around and leave it for krsna to deal with it.
There is a saying "people may be unkind, just be kind, they may cheat u, just be honest. They may forget your good deeds, just do good. In the end, its between U and God, not U and People...."
