Sure, you can make money when the market goes down, if you know it's going to go down.
You see, that's the problem with the common approach... it isn't like a race track. At a track, it's about picking your winners: "Fat Sally", "Blue Demon", or whatever moniker your favorite horse is named. So when you double up, just like everyone else who hits their first winning streak, you lose it all on attempts number 4 or 5.
If you look for a market reversal but you're not really sure, in other words, there's a real split frame in the indicators, you go short and simultaneously buy a call option to go long. The option is paid for upfront and is 'in the money' when it hits your strike price. This is a hedged position.
Thus, you can in fact, get it wrong and still not have a major losing trade. Right now, a lot of astute traders have bought puts (shorting options) for the S&P and Nasdaq, knowing fully well that they need to protect their long calls on the markets esp given both the Januarty effect and excess stimulus in the system. Yet, if the market crashes, they've minimized their losses. On the other hand, a lot of mutual funds, via 401K contributions, are simply buying S&P deposits (long only) and will get toasted if the market collapses in the spring. As you can infer, the people who're mainly toast are the average worker bees who're depending upon their 401Ks for retirement.