"Security bugs" are after all just a specific class of bugs and are still a huge nuisance in non-critical applications as a crash one could leverage for circumv

"Security bugs" are after all just a specific class of bugs and are still a huge nuisance in non-critical applications as a crash one could leverage for circumventing some security boundaries means most often just a unexplained crash for the common user, which just wants to use a tool in good faith. So, reducing security bugs means less crashes on weird input, less leaks (better resource usage), just a more stable tool as some classes of bugs (which may or may not be security relevant) are just eliminated completely - that's a big deal as with rust the (runtime-)cost other languages avoiding this is just not there (or much smaller).