Darko, This information is out there, unfortunately with the current advocacy agenda of our media you really have to dig deep to gather the information to figure out what is the truth. Another example of the deep bias of US media is the amount of coverage given to Trump hater who hoped to kill and maim volunteers at a Republican "Get Out the Vote" effort in Florida this past weekend. Charlotteville, VA is still referred to on a weekly basis as evidence of the evil forces behind Trump. This will get no mentions after Wednesday.
Documents show when Biden and his partner started receiving payments, when Kerry's stepson, to his credit refused to be a part of the money laundering, even NY Times and WaPo stories contemporary with the event questioned the optics of the arrangement H. Biden had as J. Biden was VP.
You are absolutely correct that Burisma was being investigated prior to H.B. coming on the board. There is a lot of evidence that points to Biden's involvement on the board was an insurance policy to shield the corruption. When you see the timeline, especially the request by Latvia's Financial Crimes Investigation Unit (laundering of criminally attained cash types of crimes) of the similar anti-corruption unit in Ukraine and the firing of Shokin (who had been appointed only 10 months earlier to crack down on corruption in Ukraine) during VP Biden's visit 2 weeks later, exactly as Joe Biden described himself in a later video of his comments.
Back to an earlier point, I look to a lot of international news sites for perspective and a better opportunity to find the truth. For example the Jerusalem Post and AL Jareza for middle east issues. Please forgive any mispellings, I'm a little short on time to edit.