Who is "we"? Are you from the US by any chance? Do you mean that the US government should rewrite every piece of core architecture (including Linux, Ssh, Nginx...) from scratch? Because they are all "contaminated" and actually were created by non-americans.
If that's the case, you do you. Do you also think that all other countries should do the same, and rewrite everything from scratch for their government use (without foreign, for example American, influence)? And what about companies? Should they be forced to switch to their government's "safe" software, or can they keep using Linux and ssh? What about multi-national companies? And what even counts as a "core" software?