Earlier quoted context omitted.
I don't buy that theory. First of all: outside of the party "Die Linke" and the left wing of the SPD, there's little ideological friendship to Russia in German politics, it's either regular corruption (Gerhard Schröder) or industrial politics ("you give us cheap energy, we keep our eyes closed and don't mention the smell"). If anything, actions like these will make Germans more willing to spend extra money on defense…
You both are right. Don't forget that "Die Linke", "SPD" and other marxist invested parties serve the same role today as they did during the first cold war. Their ideology works towards a class struggle by uncivil means, destabilising their democracy. The same goes for their economic policy, it would drive the country into the ground. Or the "greens" using terror and fear campaigning against nuclear energy in the pas…
I'm sure that's true in general, and you'll never know whether you did someone else's bidding without realizing it, unless they tell you (but would you believe them?) or you uncover some huge conspiracy (but then who says that's not fake to make you do something else?). I vaguely remember an interview that Adam Curtis made with some British economist for one of his movies concerning stagflation and the general direction of the economy and wages at that time, and he said something like "when I can't sleep, I sometimes wonder whether what we did was exactly what someone wanted and they knew what would happen".
As for Die Linke, (the far-left wing of the) SPD and the Greens, I don't believe they're malicious. I believe they mean well, even though I probably disagree with them on most of their core issues.