Excuse? Where? No, the problem is with the disease that the drugs are treating not the drugs themselves. If anyone is making excuses it is you - blaming the drugs.
It seems obvious that these drugs are ineffective and only harm the patient more.
That is because you are a lay person only superficially knowledgeable in the phamacologicaly basis for psychiatric medicine. A few anectdotes - your experience being - do not paint an entire picture, furthermore you are not a trained professional knowledgeable of all of the "ins and outs" of the case.
Similar arguments are made to outlaw hand-guns based on school and workplace shootings. Isolated incidents are just that isolated and are not a basis for policy or therapy.