Sure Rust is better on it, my point is that it is there, despite that community making it a Big Freakin' Deal to have all the memory safe they could design into the compiler and language.

If even they had to add escape hatches despite the presences of powerful language primitives like types, traits, borrow-checking, maybe the people charged with making it all work with 80s compiler technology weren't the literal Antichrist for also having UB as Rust does.

For what it's worth, C and C++ are much different in terms of hazard, so when you bucket them together it makes me wonder how familiar you are with the actual risk of UB in practice.

Nowadays it generally stems from doing weird things.... but no one is making you do weird things, any more than people are making you use Rust's unsafe keyword.