Fortunate that this Britannia 757 in the second photo didn't land at Southend.
You could say that of several hundred other airports too. The Britannia 757 came to a halt (minus engines removed by the airport perimeter fencing) way beyond the safety zone afforded at a great many airports, which is part of the reason it took the RFFS team so long to actually damn well find it after the accident. It was a matter of providence that it happened to be at Gerona where the relatively benign terrain around the airfield afforded far better prospects of avoiding injury to those aboard and around than would have been the case at many airports.
Apply the same path divergence off 23R at Manchester and you'd be through and beyond the Aviation Viewing Park on the way to last orders at the Romper, off 08L at Gatwick and you'd be in South Terminal and off 33 at Birmingham and the old noise bunding for the cross runway would have provided a hard stop.
It's a grossly exaggerated (and perhaps deliberately provocative) view to condemn Southend as unsafe on the basis of the excursion path of the 757 at Gerona. That accident would certainly have had a far more insidious outcome if it had happened at many, many other airports. That it did not is something for which those aboard can be thankful, yet it has been recognised as an outlier in such incidents which has established no basis to review the safety zones applicable at all airports and any permitted derogations from them.