kubelet's enable-debugging-handlers command line flag should default to false(?)

"/run/", "/exec/", "/attach/", "/portForward/", "/containerLogs/", "/runningpods/" etc are installed at:
https://github.com/kubernetes/kubernetes/blob/master/pkg/kubelet/server/server.go#L306

These are supposed to be used ONLY for debugging, however they are always on by default. Can we please default `enable-debugging-handler` to false, so these are not installed by mistake? 
