Whoever justifies purchase of hugely overpriced MQ-9, P8I, Romeo, SIG rifles, Chinook, M-777, F-404, F-414, Javelin, KC-135 and other stuff is either on American payroll or an idiot.
If India buys American weapons, it doesn't buy influence too. It only buys more dependence and loss of whatever nearly mythical strategic autonomy is left.