There are always to sides on a coin. So yes you are true, if the News will push the USD higher than this idea will not work. That is the risk. And I have to take my losses when the stoploss will get hit.
But almost nobody knows the news in front, so you have to make an expectation from the information you know. And I get these information from the charts. From there I will calculate my odds, and if the Risk / Reward ratio is in my favour it is worth the trade..
The chart shows me. The chance is higher that USDJPY will move down. On the larger timeframes we are in a negative trend. We see divergence on the RSI. And we are in a resistance zone.