Doing nothing means doing nothing. Inaction here does not mean that there is nothing wrong, but "unintentional"

Anything that goes with the flow will naturally develop in a good direction, and there is no need to interfere. If you interfere, you will break the original law and develop in an unpredictable direction. It will be difficult to adjust.

For example, Tathagata cut off the meat and fed it to the eagle, but he didn't expect that the pigeons that should have been eaten were taken away by the eagle because they were not strong enough, and the pigeons that were not strong enough returned to the population, which would cause the population to degenerate. In the long run, the pigeon population will become worse, and it is likely to become extinct when it meets new natural enemies, so even if you interfere with it out of kindness, it will not have any beneficial effect. This is the truth of "inaction"