Lydia: Each year, thousands of seabirds are injured when they become entangled in equipment owned by fishing companies  Ttherefore, the fishing companies should assume responsibility for funding veterinary treatment for the injured birds  Jonathan: Your feelings for the birds are admirable
Your proposal, however, should not be adopted because treatment of the most seriously injured birds would inhumanely prolong the lives of animals no longer able to live in the wild, as all wildlife should
He attempts to discredit her proposal by discussing its implications for only those birds that it serves least well.