I think some of the quotes you have presented to us Keith do precisely what you say they don't do.

Moreover, even the suggestion that there are disagreements as to how antisemitism can be defined has in itself been attacked as being an antisemitic thing to say.

There's somethong of an Alice Through the Looking-glass thing going on - 'When I use a word,' Humpty Dumpty said, in rather a scornful tone, 'it means just what I choose it to mean — neither more nor less.'