The reason Trump and his people are being investigated is because they either lied, forgot, or somehow neglected to fill out their forms correctly.  It is appropriate to do so.  For Clinton to be investigated, at this point, does seem self-serving and has the appearance of creating a distraction to the Trump investigations.

Politics is a dirty business and is really not about ideology.  It is about power.  Pure and simple.  Always has been.  To focus on who did what when is to miss the point.  Follow the money and we'll see who really runs things.