All (current) languages eventually have a compiler/runtime that is memory unsafe. This is basically fine because it's a tiny amount of surface area (relative to the amount of code that uses it) and it exists in a way that the input to is relatively benign so there's enough eyes/time/... to find bugs.

There's also nothing stopping you from re-implementing python/ruby/... in a safer way once that becomes the low hanging fruit to improve computer reliability.