1. Them, still, because they are the ones who did the things.

This is like asking if I am still going to be blaming Japan for bombing Pearl Harbor, Andrew Jackson for the Trail of Tears.

2. Well for example, Gen Z and Millenials have been, collectively, much more concerned about climate change and trying to have their voices heard, but the Boomers have also destroyed both the US Political System/Government and also Economy, and you... can't really socially act from a position of little to no social power.

Your framing of this question does two things:

It misses the point that climate change is a time sensitive issue with a window for being able to address it. That window is largely passed now, now we are in the stage of 'how do we mitigate/survive this' instead of 'how do we prevent this'.

And this is also victim blaming. Hey I burned down your house, why are you homeless, what are YOU doing to solve YOUR problem?