Paul carries on the supposed objective to his principle of
love. Why incur the risk of being evil spoken of
(lasph(886d)oumai) for the sake of maintaining one's liberty? Is
it worth it? See  Ro 14:6  where Paul justifies the conscience of
one who eats the meat and of one who does not. Saying grace over
food that one should not eat seems inconsistent. We have this
very word _blaspheme_ in English.