If you don't think C or C++ are sane languages you are never going to write any thing sane for Von Neumann computers imo. Much less something cross platform.
Heartbleed was reviewed twice by literal OpenSSL experts and security experts who were specifically looking at it to determine whether it was a security vulnerability or not and concluded (incorrectly) it was not. And now it's the poster child for bad software bugs.
It's really hard to write correct software in any language, and time has shown again and again that memory safety is just not something you can hope to do without if you care about security in the slightest.