@Asoke sarkar For obvious reasons those so called "renowned" say such things when one of their own gets a battering from the regulator.
The process of day trading is plagued in our system, not because day trading or infact just trading is harmful or unwise to do, but because of the environment created around it. Proper education and guidance is missing on the same.
The so-called knowledgeable persons in this field (TV Analysts, Brokers etc) are only here to make matters worse. They always try to lure vulnerable people that are fascinated by the euphoria, but they never show the other side of the coin.
If one wants to make big, he has to invest big and stay in the game for longer and witness the negatives. The same applies to intraday, you have to respect the profits and the losses. But the information provided is in such a way that its inherent meaning comes out to be : Intraday Trading results in erosion of funds.
Even, the regulator has indulged to make it more of the opposite case by mandating the "dialog box of every 9 out of 10 traders incur losses" visible on every brokerage platform.
As investing involves constant improvisation, so does trading and this is the only fact if understood well, will eventually yield well for prospective traders.