Just a few more thoughts that have occured to me, and you might find of interest?
The Scottish estates where deer live and breed often cover thousands of acres of the most inhospitable land in the UK.
Deer range free on these estates.
Although there are roads(mainly unmade tracks) through them,they are few and far between.Sometimes herds of deer,who naturally are not used to humans and will shun any place that has a human smell, can be up to 10 or 15 miles from such a track. Whilst the owners of such estates will put out food in bitter weather the deer may not come down to the road for it,and of course the owners (even with quad bikes) cannot get it to the deer.
Even though(at present) these estate owners do not make much out of hiring the land/deer for stalking,or from venison gotten through culling,it IS in their interest to try and maintain the deer population.
We should also remember that the ponies on Exmoor,Dartmoor and in the New Forest are also consicered to be "wild" although they belong to people.They (like the deer) are allowed to roam freely,and are only given feed during bitter weather,mainly because(again like the deer) they often roam in areas inacessible to their "owners".
This is very vexed and confusing subject.Some would ask, where do we drawn the line,do we put out food for ALL wild animals regardless,or only those we feel sympathy for (or are "owned").I realsie that you feel for the deer,but they ARE looked after (when necessary) to the best of the estate owners ability.