I don't think anybody 'wants' to not know German in Berlin - it's just that they've decided it's not worth the effort at all or they are ok with their A2 level

I don't think anybody 'wants' to not know German in Berlin - it's just that they've decided it's not worth the effort at all or they are ok with their A2 level even though it's obviously not ideal. I know trilingual people in Berlin who just aren't going to learn German, a fourth language, beyond A2. I (native English speaker) personally aspire to getting to B2 from my current A2 though.