[alkonaut]

Isn't the "use it properly"-argument pretty much the same arguments as those saying that real C developers don't need the safeties offered by rust, they just need to use C or C++ properly?

The whole idea of language design (in my opinion) is to reduce the opportunities for mistakes, without getting in the way (thus reducing productivity). The biggest problem with Java and C# is that they are deceiptively simple. Anyone can get off the ground and the path of least resistance initially is the path of maximum pain in the end. That's the path of making large classes, lots of mutable state, long inheritance chains and so on. The languages aren't forcing anyone to use these antipatterns, but neither are they guiding the hand of the newcomer not to do that.