Redis has RCE exploits which would not exist in a memory safe language [1]. QMail had an RCE as well[2] and DJBDNS has had a security bug which would not have occurred in a memory safe languages [3]. The linux kernel has had an incredible amount of memory bugs over the years. The software you mentioned does much, much better then the average C written code. But it still has had issues with memory. So in fact all your examples prove my point.