So why doesn't that "tainting" process work when Europeans support fringe groups in democratic Israel?
It turns out that various politically active, generally far left-wing Israeli NGOs, some of which deny the very legitimacy of the Israeli government, get funding from various European governments (see, e.g., this detailed NGO Monitor Report, which focuses only on funding through the EU itself; member states provide substantial additional funding). Some of these organizations, for example, support the international “Boycott, Divestment, and Sanctions” efforts against Israel. (Exactly why European governments fund NGOs whose views diametrically oppose the governments’ official policies vis a vis Israel is an interesting question that we’ll leave to another time).
These NGOs are often given special legitimacy in the international media because they are purportedly Israeli NGOs. NGO Monitor’s investigations show that many of them are, in fact, organizations with little if any domestic base within Israel and instead represent the views of the international far left with a fig leaf of Israeli leadership drawn from its domestic far left.
I freely admit that I struggle with the concept of "nuance." I'll keep working at it.