The elephant in the room/that one awkward moment

Imagine this. We're sitting in class and then it comes out. We've all dreamed about it. We've fantasized about it. We've laughed to ourselves over it. We've had grand visions with surreal detail: the flushed cheeks of those around us; the embarrassed laughter; the horrified expressions of onlookers. It had been building and bubbling up to the surface ever since the beginning, only to explode now in an enormous release of tension that stifled the room in choked gasps of disbelief. Emitting such outbursts in public is as taboo as it gets and is then forced into the confines of collective mental oblivion, hence the elephant in the room. But there it is, staring you in the face like an evil, brown cloud of smog hovering languidly over a congested city. Morally speaking, why is it that we simply cannot do such things? What makes it wrong? Everybody feels it from time to time. To deny that would be like denying our own humanity. So why can't we, you know? Why can't we just go ahead and fart in public? It's part of our Biology, isn't it?