Take a look at the Type A chart for LTN and you'll see exactly what I mean.
Note that I'm not suggesting that LTN is unsafe, only that it does have hazards at the end of its runway as do many others such as LCY and SOU to name but two. Generous length Stopways and RESAs, such as now exist at SEN, help mitigate the consequences of any undershoot or overrun. If all airfields could have 2,000' of flat grassland each end of their runways that would obviously be ideal, but they haven't so don't single out SEN in that respect as it is now considerably better than many.
People with an 'agenda' often make criticisms of aspects which don't stand up to examination and this is a case in point.