I don't think the two things are comparable. Germany is religiously pro-Israel and any attempt to bring more nuance into it than "Israel good, terrorists bad"

I don't think the two things are comparable. Germany is religiously pro-Israel and any attempt to bring more nuance into it than "Israel good, terrorists bad" is seen as antisemitism. This also nicely fits with the idea that antisemitism is mostly a problem of Muslim immigrants or of the political left (to be clear: the dishonest framing of the NSDAP as a "left-wing" party is largely an American thing so this is entirely about the conflation of anti-Zionism and antisemitism, not about labelling the left as Nazis). The problem with Covid was that although Merkel initially talked about following the evidence, the start of the pandemic fell right into the leadup to election season and she had already made it clear that she did not want to run for another term and this created an additional internal struggle for the positions of both chancellor candidate and leader of the party. This resulted in the various minister presidents of the Länder (states) to use the pandemic to demonstrate their political savvy which was made worse by the federal system delegating various decisions to the individual Länder rather than allowing the federal government to call these shots. In the end the response to COVID in Germany was a mixture of overly draconian measures (e.g. banning meetings between different households even in the open, making demonstrations illegal and shutting down playgrounds) and ineffective half-measures (e.g. appealing to "personal responsibility" and letting schools figure out their own hygiene rules without giving them a budget). This also played into the existing Q-Anon-adjacent movement (the second largest one internationally after the US), anti-vaxxers and other fringe extremist groups like the German monarchist-flavored sovereign citizen Reichsbürger movement giving rise to the ("non-partisan") Querdenker or Querfront movement which was primarily focused on COVID denialism but used it as a jumping off point for various conspiracy theories and New Age beliefs. This movement in turn saw a surprising amount of popularity with celebrities and thus resulted in anyone opposed to any anti-COVID measures for any reason to be lumped in with the movement, much to its benefit. The Querfront movement seamlessly moved on to being a "peace movement" in opposing the military support of Ukraine against the Russian invasion, although this incidentally quieted down after the EU sanctions against Russia forced Russian state media to pull out of most European countries. The problem with getting info on Gaza from Twitter however is that Twitter is now filled to the brim with disinfo and misinformation. While the pro-Israel propaganda is mostly easy to spot because it originates with the IDF or Israel government affiliated accounts, the anti-Israel propaganda is mostly spread by random people for engagement and clout.