no, the point is that many FAA-approved emergency procedures require the flight crew to land at the NEAREST suitable airport for reasons of SAFETY ... availability of airline staff NEVER enters into consideration
I'll dig up the link later, but a few years back a DL 757 operating JFK-LAX lost an engine shortly after starting descent (~150 miles out) ... using your logic, they should have risked being written up -- or perhaps fired -- for violating the FARs (or, as a minimum, company policy) and just continued on to the destination where they have maintenance facilities, rather than subjecting the passengers to a ~4-hour delay while Ops rustled up a 739 and crew to ferry everybody back to LAX (if memory serves, they deadheaded the jet from LAX)
yes 4 hours isn't 30, but sometimes s#!t happens when recovering from things going pear-shaped ... the FIRST order of business is safety