Moreover, you'd be right. Well then, let me lay this on you - homeless people do that kind of thing all the time. They don't even have errands. Or if they do, then all that yelling and begging probably is the errand. This callous and wanton disregard for the mores of society would, I can safely assure you, stop very very suddenly if we were to really roll up our sleeves and kill all of them.
Dead men tell no tales, after all.
More to the point, they don't shriek when you prop them up on street corners and put change cups in their stiff fingers. They're actually soothingly quiet and unobtrusive. Like a jet of wafting summer air off the ocean. Except dead, and with a tin cup. One only has to use a modicum of common sense to figure out that anyone sitting and shrieking on streets when they should be mowing their lawns and watching real-life castaway shows is no doubt a shifty and suspicious villain of mystery.