You realize this thread is talking about a group collectively, right? So yes, you can absolutely blame America as an entity for foisting Trump on the world. Why on earth couldn't you? People seem to be unable to separate individuals from the actions of a group.
As far as a group goes from a governance standpoint the baby boomers have been an unmitigated disaster.
I'm not a baby boomer...I would say I find myself defending boomers about 1/3 of the time, and defending Millennials the other 2/3s.
But my gripe about the whole generational-conflict thing, is that it seems to be regularly used as a smokescreen to avoid talking about the divisions that cut across generations.
In particular, affluent, middle-class, white younger people will blame everything on baby-boomers, as a means of ignoring the groups they are part of that are even more 'responsible', in a collective sense, for the ills they are complaining about. They are trying to get their fellow, less well-off, Millennials to not look at them.
Worse, some rich white older people who created most of these problems, will also go on about how awful their fellow baby boomers are, getting younger people riled up about the problems _they_, the most privileged of the older generation, created, but diluting the blame by spreading it onto the less fortunate of that same generation.
The other thing is, the post-war boom in the US started much earlier, and went on longer, than in most of Europe. So maybe your boomers had it a bit easier for longer. Plenty of baby-boomers here barely even noticed the supposed 'good times', if they happened to be working class.
And I still am not sure a young middle-class white American Millennial now would, for example, really want to swap places with a black American in the 1960s.