Sure, a given mechanic or a given surgeon might err. So go get a second opinion. But if you get 99 second opinions, and all but one agrees with the original mec

Sure, a given mechanic or a given surgeon might err. So go get a second opinion. But if you get 99 second opinions, and all but one agrees with the original mechanic, rejection of that diagnosis is an extraordinary claim. And an extraordinary claim requires strong evidence and reasoning if your decision is going to put the lives of others at risk.