simply because those states enjoy those rights are the poorest ones I believe, in every country there is a gap between the different regions in all countries and all peoples and therefore they are not only in India and we cannot blame them if they are like this
If you follow politics and elections in India you would understand that the states I quoted are the ones that have a high number of seats for the Lok Sabha election. The Southern states are high contributors in terms of central revenue but the seats in the Lok Sabha election are lesser than the North State. That is the reason why they get more development funds than the Southern states.