It doesn't need to be TS for open source(but for closed, I'm leaning yes). But all code for these core technologies need to be tied to a real person that can be charged in western nations. Yes, it will make it harder to get people, but with how important these technologies are, we really should not be using some random guys code in the kernel.
Don't forget that the NSA bribed RSA (the company) to insert a backdoor into their RNG. Being in western jurisdiction doesn't mean you won't insert backdoors into code. It just changes whom you will target with these backdoors. But they all equally make our technology less trustworthy so they are all equally despicable.
