Everyone  should  speak more than one language.    German is a very good choice for the WN movement.    But don't under-estimate the value of the asian or Spanish languages. Japanese can be the key to high paying jobs, Chinese can make you indispensable as things progress onwards, and Spanish lets you know what certain criminal elements may be saying about you. This is about intelligence gathering and tactical awareness,  not  subservience. Do not confuse the former with the latter.    There's no reason to get hung up on knowing only English - in fact, an insistence upon not learning any secondary language is just shooting yourself (or your kids) in the foot.    I would also say that if you're only going to speak one language, then one had damned well better be an expert in it, with impeccable grammar and spelling.