Depends on what how we define "applicable". For instance, I don't find the ignorance of hatemongers applicable to anything useful in the twenty-first century, so I certainly wouldn't trust their ridiculous pretenses about morality. Ask me about getting a tattoo the next time we're lost in a desert, together. Practicality is one thing, but I don't know, if the kids are going all goth and everything, y'know, 'cause flails are sexy, maybe people without scientific equipment like electron microscopes will go with morality instead of microbiology. Besides, when did telling the kids it's dangerous ever stop them?