Ah but MGM-Lion they are not going to kill a great number they are going to kill them all (admittedly a great number if anyone wishes to be pedantic about it) so they are not going to be "decimated" they are going to be annihilated, or exterminated.

If people wish to use language incorrectly then that is up to them - but in the case of Richard Bridge I would have thought that someone trained in the law would know better.