Watching just 2 episodes of NatGeo's Taboo was enough to reassure the need for cultural acceptance. Some people believe in eatting fluorescent lightbulbs coated in mercury, while others volunteer to be envoked, or at least entranced, by foreign spirits. Some cultures go to Kelsey Seybold Clinic, while others slit a goats throat and visit the witch doctor.
The problem is not necessarily WHAT another culture does, but rather how it is judged by the rest of us. Who's to say that someone putting their life on the line for a moment to test their faith, or preserve their heritage, in a way that appears dangerous or illogical is any better or worse than someone who damages themselves slowly over time by social acceptable mediums (i.e. mcdonald's, marborough, budwieser)?
Respect people you don't understand, until you decide to take the time to understand them.
