A huge number of medical treatments and interventions have been developed - mostly over the last 100 years - that are way more beneficial than they are risky. Some treatments have side-effects. Some have unexpected, or long-term side effects. Some have awful life-altering side-effects. That's all true.
But to say "mother nature is an unstoppable force" to support the idea that all medical treatment does equal harm and good is crazy. Health interventions - from clean food and water to drugs and surgery - have improved and lengthened the lives of billions over the last century.