Losing is part of successfully trading. If you treat losing as part of trading then you are an experienced trader.
Sounds like a gambling philosophy, still could not ignore its meaning. One of the basic thumb rule of trading is we cannot prevent losses but we will be able to cut the losses early when it will be very small. Yes, losses also a part of trading.
I don't think it is much of a gambler's philosophy than it is trader's way up the ladder of profitable trading. Losing is inevitable in a financial market, because there are countless factors at work at any point in time in the market. Understanding just that, puts a trader in the right position to research and develop ways out of such losing proposition since the market have proven to be cyclic in nature.
A gambler's philosophy is very different from a trader's philosophy. Although they may be the same in the aspect that losing money is always a probability, they are different because in trading, you have trends and movements to follow, and it's not totally due to chance. Unlike in gambling where winning is mostly due to chance and luck. In trading, I think the more experience and knowledge you have, the better chances of success you would get. Losing is always part of anything, which a person should accept.