Can someone explain why I am liable?
That's the priveledge of being an Officer. I think it may be called Man Management, something that we are told our managers have plenty of experience of...
The solution is simple - ensure your erks are given plenty of time off to de-stress, and never mind that the job is not done, and finally, even as a boss, you will have a boss, complain you are suffering from stress and demand some more gardening leave.
No Stress.