It’s also not unique to Germany as well. As an American its crazy how much this just sounds like what’s going on in America with the Democrats slowly shifting to the right on things like immigration. Capitulating to the right wing framing on these issues doesn’t help you win, it just pushes more people to the right since you’re basically saying they’re right.
I think the main worry is an escalation not to a full blown WWIII style full nuclear exchange but to using tactical nukes against Ukraine. We haven’t really seen that used yet and if Putin thinks he might lose this I don’t know if he would decide to do it. And once that precedent is set that you can do that there’s no putting that back away. This isn’t to say that giving them this permission is bad or shouldn’t be done, this is just a risk to consider and would be a risk with any strategy that allows Ukraine to attempt to win the conflict.