That would simply adjust the definition of "normal", since everybody's doing it. For example, it's now "normal" that liquids are banned in airports (except, of

That would simply adjust the definition of "normal", since everybody's doing it. For example, it's now "normal" that liquids are banned in airports (except, of course, for those sold at a premium once past "security"; and except for pesto https://www.theguardian.com/world/2017/jun/23/genoa-airport-lifts-liquids-ban-for-pesto https://www.theguardian.com/world/2017/jun/23/genoa-airport-... ). I think, in general, that it's better to do the opposite: if someone wants to do a stupid thing, make them look as strange as possible; try do the exact opposite thing, so that their rationale (e.g. "otherwise terrorism") is undermined. Plus, of course, that opposite thing might be a good idea on its own.