Yeah that argument has come up in some of the forums. I think the issue isn't that Lego has policies about such sets, but that these policies seem to be interpreted differently on occasion, and in this case the decision was seemingly forced by a protest group making a fuss. If Lego had initially (and to be fair, correctly) identified this as a military vehicle, it wouldn't have gotten past the idea stage.
And if one is highlighting military connections from Lego's existing licences, Volkswagen anyone? Especially given the latter's rather optional approach to environmental considerations in the recent past.
