In the UK there has been a lot of talk in the past (County Wildlife Trusts etc) about creating wildlife corridors - there just isn't the space for large wild areas in many populated parts of the world such as here. Joining up and improving/creating fragments to allow dispersal and gene flow of many species plants and invertebrates and up (perhaps a suprisingly large number of organisms could 'co-exist' athough some would need 'managing' - already gardens are something of a refugia for plants and inverts from more sterile farmed countryside). Humankind and the farmed landscape (even seemingly wild areas have been altered by man historically) isn't going to go away.Just reintroducing wildlife into areas where it had lived before being either hunted to extinction or disappearing involuntarily due to man-made destruction of or changes in its ecosystem is bound to fail as stated above.
Humans cannot undo what they did just by trying to force an animal to live somewhere again.
The only way this could be achieved is by making areas, large areas, into wildlife refuges - basically completely natural wilderness. Without human intervention maybe the ecosystem there would once again (d)evolve into one to which the respective animals would be drawn naturally.
One can only asume that those reintroductors have little understanding of the holistic nature of the system we live in - and are so busy destroying.
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