Your opinion is obviously not a medical opinion. Does your distrust of medical professionals extend only to vaccinations and antibiotics or do you not trust cardiologists and surgeons and oncologists and so on?
In any case, reducing the period of infectiousness from weeks to 5 to 10 days is an improvement. Quarantine of the patient is easier for a shorter period of time as opposed to a longer period of time.
Less infectiousness equals less transmission of the disease.
And how do you think they reduce the infectivity? By killing the organism, of course.