A bird flying past the tipsies could set them off, and then a two-man MART team would have to visit the site and investigate what had tripped them—because the complexes didn’t have security cameras topside. A missile crew had no way of knowing whether the tipsies had been set off by a squirrel or a squad of Soviet commandos.
They might even be soviet squirrel commandos! ¯\_(ツ)_/¯
