There is ample evidence to suggest that the attackers were thugs from the Right Sektor, C14 and Dnipro-1, who had been recruited by the US to instigate the putsch. There were also Georgian soldiers who were acting as snipers, shooting both demonstrators and police.
Maybe Yanukovych deserved to go It seems like he was certainly accepting that possibility (probability) when he signed the EU-brokered agreement on 21 Feb. The fact that that agreement was never even given a chance is what indicates that there were nefarious extra-legal forces in play.
As far as a dictatorship is concerned, it seems that is exactly what Ukraine has now: banned media outlets; banned political parties, and so on.