think about the over treated birds with a severerly compromised immune system , this poor bird wont have the constitution to face the stresses of training and the race basket and if looked after in a proper way from the offset the stress of racing wouldnt be too much for it , i think you would be right to be upset that our birds immune system would be stronger and more vigiourous to not be as easily supceptable to infections because of there remarkable constitution , unlike a bird propped up with medicines doing more harm than could see a basket come back ill and much easier to blame everyone elses birds than look at how there birds got so weak , a wild bird that gets ill doesnt see a vet it dies its natures way