Why  is "Law & Order" made a State subject under the  present Constitution of India ?

The  present Constitution allows any "popular fool / criminal"  to become the Chief Minister of a State  ,according to Constitutional experts. So usually the most criminalized and corrupted politician becomes the Home Minister. Abusing his discretion and  position he can  maximize the amount looted from the Exchequer for his party's purposes , by bribing the public with all kinds of daily necessities . Also he can connive with Jihaadhi groups to  eliminate the Opposition ranks like Stalinh used to do in USSR, using the State Police , 80  per cent of whom are Criminals in Khaki.