In the medical field, cases of interventions being harmful are not rare, and entire classes of interventions have been reconsidered in light of evidence.
There's several billion medical intervention of all kinds every year, harmful interventions do exist but they are only a very tiny fraction of the total.
Yes, but there are _kinds of_ interventions which turned out to be systematically harmful. For instance, in most developed countries it was a policy to thoroughly wash newborns, until they realized it was harmful.