Hmmm you’re right, Einstein.
That perky blonde cheerleader in the commercial probably WAS married to an elderly Sikh.
That’s much more realistic.
More realistic is that TV advertizers were responding to a trend in men’s fashion.
http://www.nydailynews.com/life-style/fashion/beards-style-comeback-article-1.1421137
However, since you insist:
BBC: Are beards obligatory for devout Muslim men?
http://www.bbc.com/news/10369726