It is ironical that people HAVE to criticize wherever a political person is involved, no matter what; even though the issue is reasonable. Fraud and slandering is becoming increasingly common on the internet that provides complete anonymity to the perpetrators. These acts are crime under the CrPC and a person can be arrested and sentenced. Change of medium, in this case the internet, is no excuse. The GoI recently enacted the IT Act precisely to contain the crimes done on the internet. There should be no reason why Mayawati, as a citizen and as an important public functionary, should not take steps to curb these activities. If something of this sort happens to an ordinary citizen, s/he can also resort to such remedies that inevitably involves "spending public money". Just because Mayawati happens to be a politician does not mean a crime against her ceases to be a crime, and the appropriate steps taken by the enforcement authorities are "waste of public money".
It would help if public opinion is more calibrated and reasonable.