Exclude drug-related murders from both Germany and the US. The remaining violence statistics are on par.
Absolutely complete BS. There exist no reliable statistics whatsoever that shows whether a particular crime is motived by drugs or not. Motivation for a particular crime is not tracked on any national level, so your post is complete speculation. The US has a far higher violent crime rate than any other country in the western world.
Today, the process does not incur any cost, is almost instantaneous, and you do not have to surrender your passport, answer intrusive questions during a life interview that that could go anywhere, depending on your answers and whims of the interviewer.
When is the last time you traveled to the USA? It is a nightmare. One on one pre-interviews in the airport you're departing in Europe, then another quite intrusive interview upon arriving in the USA. You're completely at the mercy of the interviewer. If he's having a bad day, you'll be stuck with a permanent note on your record, making all your subsequent visits even more painful.
Understanding is always the understanding of a smaller problem in relation to a bigger problem. -- P.D. Ouspensky