Atheists; what do you base your morals on?

[Whateverist]

There is people who don't have empathy (due to mental illness) but chose to act morally and believe in morals. How do you account for that?

Yes they are more dangerous then others, but at the same time, they can chose to act morally still.

I'd say a set of by-the-numbers morals is good enough for someone who is so impaired that they'd otherwise be a danger to themselves or others. If the humanity which would thus be diminished is intact and flourishing then the price would be far too great and completely unnecessary.