Because not only do they rely on bad translation, they don't understand Mishna and Gemara.I sense that you are looking at a translation of text in a vacuum and trying to imagine an observance driven solely by those words. That would be impossible as there is not that much explanation given in the text. Judaism has much more in the way of text and instruction which we date back to biblical times. We can't understand how people can think that any observance limited to the written verses is possible.