They are not the prime ministers now. The context that we are talking here is about the current govt. If the previous govts had lots of wrong doers then it doesnt mean the current govt doing the same is okay. Get your priorities straight.
Using the same argument - we shouldn't discredit those crimes and criminals just because they are not prime ministers or chief ministers now. Get your priorities right.
The blatant copying of the successful ideas of others to the maximum extent legally allowable under one's prevailing legal jurisdiction is an activity pursued profitably by people of many ethnic groups and nationalities.