First of all. Martingale isn't a 'strategY'. Well, it is, but it is only a money management strategy. iA person who uses martingale, as myself, only doubles or triples after a loss, depending on the formation he or she is trading. Formations with low expectancy of consecutive losses are the ones which you want to use martingale with, because after every loss you chances of getting your tp hit is increased greatly.
So instead of telling people to not martingale, why not ask first which system they are using WITH martingale.
@GJscalper for more information