Cyclists wanting to go 30 clash with the majority of cyclists, we’re used to it. The outdated infrastructure doesn’t help, either, some of it is literally the ~50cm asphalt lanes Nazis more or less painted on sidewalks to get bicycles off the streets, “to not hinder progress”. Luckily you’re not required to use them if they’re intolerable, which they generally are. Especially in Hamburg. The kind of annoying thing is that the large concrete pavers they used for the sidewalk actually do last ages, even roots pushing them up don’t really do damage pedestrians would care about, and many municipalities bill property owners for street refurbishments and politicians don’t want to face pitchforks or change the statutes (and spend municipal money) so nothing gets done.