Quote from drcha:
When you go to Vegas, do you walk around telling people not to play? I don't. (FWIW, I also don't play myself...)
I guess that everyone here is over 18 and can make their own choices, and they are smart enough to read and write, or they would not be posting here. So I think they can decide for themselves whether they want to roll the dice or not, and are capable of doing some homework to figure out what it might cost them. Most of the questions on this site from newbies are about "how do I trade" and some of the answers are along the lines of "don't even try"--which wasn't the original question.
For every single significant thing I have accomplished in my life, there were numerous people who told me I would not be able to do it. People, I presume, who either could not do it themselves or were afraid to try, or even in a few cases, may have wanted to see me fail, out of envy. Listening to negative people who see failure and misery everywhere does not provide anything worthwhile. So I ignore them--a practice which has done me far more good than harm.
Failure in trading is extraordinarily helpful. The trader who makes small mistakes by making small bets, and studies and learns from those mistakes, can learn to do trade successfully. This practice of studying errors encompasses knowing oneself, which has been rightly mentioned in this post as an essential component of successful trading. So, there is nothing wrong with failure, as long as you get up and try again instead of wallowing in it and trying to infect everyone else with a losing attitude.