Should minority languages be saved from extinction?

As most cultures would think, to lose the language spoken in that culture almost always is a devastating loss to that culture because language is a huge part of culture. What would America be without our expressions like, " a little bird told me " or " bringing home the bacon ". Losing expressions and language like that makes our culture less of a culture basically. So minority languages should be saved from extinction. But if the language no longer has importance in a culture for example, gibberish, then let it become extinct.