Comment by InsideOutSanta

The Swiss rail lines are used close to capacity. If a train is too much late, it has follow-on effects on other trains, and the whole railway system can start to run into problems. So for the whole system to work, there can't be any overly late trains. This applies to all trains, not just German trains.

So this doesn't really have anything to do with that single train not being on time, or with differences in culture or something like that, it's about keeping the system running. If you have a system that isn't used at capacity, then it doesn't matter much if individual trains run late, the system itself will still keep on running.