To answer some crtics' arguments, Dashain and Tihar are two great Hindu festivals. Non-Hindus in Nepal celebrate them because they are government designated holidays just like non-Christians in some shape or form celebrate Christmas recess in the US.
As part of Tihar rituals, Hindus worship Crow, Dog, and Cow. As you have observed by now, Hindus consume none of these animals for food. Hinduism has been around since even before the custom of recording manuscripts became popular. Therefore not every custom or ritual is  dictated in some form of scripts. Just for the sake of argument, if one is a Hindu and deliberately consumes beef, it is as blasphemous as a muslim ingesting pork.
If Hindus do not observe such taboos consistently , who knows one of these days, a devout Hindu might be served a beef delicacy by a foreign host and hell might break loose.