Nige, Chappie, et al
Support the cause without question; however, I just don't see RIAT as the place for making the point. While embarrassing people into action is effective in certain situations, the only people one might embarrass at an airshow are the organisers and that could lead to reduced participation/trust in future events. Joe Public wants to see the air display, not get involved in a political fight over military spending priorities.
Perhaps a prompted moment of reflection as the C130 displays might be more appropriate, IMHO.