Compared to what? You cannot honestly argue that Linux has better security. It's not even a priority of Torvalds and he gets angry about too much security infringing on userspace. Everyone also knows BSD is more secure by default. We're also talking just the kernel with Linux. Add all the 'hobby' type garbage that comes with DEs and you're no longer using a kernel as your propaganda. Windows has improved vastly since the 90s when people just played mild pranks and no one was banking online.