ZRH is not that dangerous. There have been a few accidents there in the past 10 years but those have been largely due to pilot error. If a pilot follows the published procedures and does DME/ALT checks there is no problem.
Lugano, where I am based
, is FAR,FAR more challenging. The approach (IGS 01) is very steep (6.65° GS). Additionally, the prevailing winds are from the south, meaning that the IGS approach is flown with a tailwind. Tailwinds and steep approaches mean speed control is very tricky. On short final (3 miles) the pilots must go below glide (ONLY IF VISUAL) to intercept the PAPI, which is 4.17°. If conditions are visual, which it is much of the time, we fly a visual approach and circle to the north and land on runway 19.
The airport is surrounded by mountainous terrain on all sides and the missed approach must be flown very precisely - track, DME, speeds and bank angle.
We also fly to Bern and London City. These are somewhat less tricky, but Bern can be a real tough one as well.
Such are the joys of flying in Switzerland!!