An interesting thread which shows the wide range of experiences of and attitudes to wild camping both in UK and around the world.
Although I've wild camped in some fairly wild and remote places in the world, I have to confess to being a bit concerned about wild camping in the UK other than in places where it is traditionally accepted (such as above the enclosed areas in the Lakes, Snowdonia and the Brecons) simply because although I have nothing to fear from any of the local wildlife, we live on a crowded island and it is difficult to get away from "civilisation" and all the baggage that that brings. However, I probably ought to grow a bigger pair and try some of the semi-wild areas on my doorstep such as the Long Mynd.
I've been lucky enough to spend a fair bit of time wildcamping in the African bush where you share your campsite with whatever happens to wander through and I've never ceased to be amazed at how animals like elephant and lions seem to respect or ignore tents. Sure there are exceptions and I did once have to help someone who had made the mistake of sleeping in a hooped bivi near a thoroughfare popular with pachyderms - a bruised shoulder and a crushed sigg bottle was the only damage but I've watched elephants gently tip-toe around guy ropes and lions completely ignore people sleeping in quite small tents even though they must know what is on the other side of a thin layer of nylon or canvas.
I'm with JT on snakes, wolves etc. - I've seen a lot of snakes which could seriously spoil your day (and probably not seen many, many more) but a decent pair of boots, long trousers and being aware of where you are treading or putting your hands help keep you safe. I've camped with wolves (only once, they kept a respectful distance) but camping in bear country would worry me a lot - and did so long before I saw the Revenant! I guess its what you are used to, I've had run ins with elephant, lions, hyenas, buffalo and hippos but am quite comfortable camping in the African bush. Being careful about tidying food away, especially at night is an important discipline but having seen the precautions that wild campers in bear country in the US and Canada have to take with regard to food etc., I'm not sure I would sleep very soundly at all. Bears don't seem to have the same respect for tents etc. that potentially dangerous beasts in Africa seem to have. That said, I've only done a few day hikes in the US Rockies so can't really claim any firsthand experience and will defer to those who have.
I guess this thread shows is that the personal security while camping is a pretty subjective concept though hopefully few would argue that guns and booze is a genuinely scary combination.