Jeez, this is like a really really big question that demands like 200 pages of historic context to really get into and parse out. Marxism today is a highly mutilated version of its own assertions starting as early as the communist manifesto, as Marxism was originally an application of scientific socialism; a theory that came long before Marx. Today we have some form of Stalinist-Maoist ideologies divorced from the classic ideas that were first put forward as scientific socialism.

As to the second question, I think it’s obvious that the consolidation of capitalism into the hands of a few and their relationship to the state and regulatory regime has been hugely damaging to humanity on a whole and that needs to be checked in someway.

This is where and why I side with anarchism, which was allied with the socialist up until the second international where Bakunin broke with Marx over the use of the state to create a communist society.