And you think it took Trump, to tell us stupid europeans, where our energy comes from and what side effects there could be?

Well, we stupid europeans rather suspected, that selfless Trump rather wanted to sell some US fracking gas.

Even today many countries buy russian gas, because it is cheap, not because Putin is nice. Just like no one thinks bin Salman is nice, but buy his oil anyway. And to be honest, I don't think Trump is very nice.

But what has anything of this to do with germany being responsible for russias Invasion - because of criticism of its own empire past?

That is the very reason for germans big public support of Ukraine btw. Not liking empires.