@nixCraft The answer: it depends if Linux is the most efficient way to meet some goal or to live according to some values, or if it's a consequence of training by some Twitter/4chan echo chamber.
It depends then if he will sacrifice his family life for these goals or values. It may also show that he's dealing with depression and/or paranoia – this would prompt for a more focussed investigation into his symptoms before e.g. marrying him.
Books from mwl.io or teachyourselfcs.com could probably help someone dealing with paranoia/depression, if needed, but it would take years. If your partner or a relative is running Linux and coping with these, redirect them to these websites.