Worried investors are pricing in far more fear than is merited of the ever-evolving audio entertainment company.Down more than 60% from their 2018 peak and still within sight of the 12-year low reached earlier this month, the idea of scooping up shares of Sirius XM Holdings (SIRI -1.11%) at this time is more than a little daunting. It's tantamount to catching a falling knife -- something you typically don't even want to attempt due to the obvious danger.And yet, there's actually a three-pronged bullish case ...