In principle, you are right, but the sentence is a fixed figure of speech.
It means: What can they actually do? It's a rhetorical question because the answer is already clear.
"Nothing"
Because everything always goes wrong in Berlin.
In principle, you are right, but the sentence is a fixed figure of speech.
It means: What can they actually do? It's a rhetorical question because the answer is already clear.
"Nothing"
Because everything always goes wrong in Berlin.