As mentioned by others, my condolences to the victims,
Anyone that has landed an aircraft at Caernarfon will know that when you've got a runway like 26, shortish, displaced threshold, trees, telephone lines, caravan site and the odd seagull that even in the best meteorological conditions it wouldn't take much to distract attention away from a glance or two at airspeed indicator or similar. Being low and slow there is very dangerous indeed. Even the most experienced and seasoned Caernarfon regular needs full concentration on this approach.
Never flown in there but based on what i can see on google earth it looks like a fine airfield with plenty length for spam cans (2400 ft from the displaced threshold) by about 60 feet wide, the trees on final do not appear that large and are about 700 feet from the threshold, again i am looking at google earth and that the info/views may be dated.