Severe undefined behaviour by default doesn't appear to be a good language design choice. Python is safe by default because you don't need to actively look for

Severe undefined behaviour by default doesn't appear to be a good language design choice. Python is safe by default because you don't need to actively look for errors: when an error happens and there is no exception handling code you get a traceback, and the only way to ignore an exception is explicitly writing an (in)appropriate exception handling cause.