I don't think that the ones against want a real game. They just want a game where you have to throw rocks at your opponent because one knows that in case of a zombie apocalypse there is no way that all the heavy weapons/vehicles which existed before would still exist. They would simply disappear, eaten by the zombies. All jokes aside, it depends on what you want. If you want a real game you have to accept that some people will have heavy weapons because they were in the good place at the right time ; you cannot possibly say you want a real survivor game if you want to put aside REAL THINGS. The Walking Dead's scriptwriters did not think that having a tank was impossible, why should we ? Heavy weapons would not simply disappear and God knows that soldiers have them.