To put it succinctly since I'm derailing the thread: money.
Less succinctly, the way I understand it has to do with a messy convergence of private property rights, high vs. low fencing, canned hunts on large tracts of private land (where one can introduce those bred deer), and a general trend towards serfdom in rural areas wherein a few wealthy landowners (either individuals or corporate) own swaths of land and the remaining smaller outfits exist to provide services (plumbing, HVAC, etc). If one essentially creates a barrier wherein wildlife cannot escape, then it's been argued that the situation resembles the sheriff of Nottingham and the monarchy wherein the public no longer can access 'their' deer and it is the possessive 'their' that is the sticking point. Wild life as was mentioned were considered as belonging to the state, but some landowners having gone to the trouble of feeding them and whatnot, considered them 'theirs.' Thus when enterprising folks began breeding deer, it introduced a whole 'nother level of complications. Add CWD to the mix and the usual corrupt nature of Texas politics and here we are.
(I didn't even get into the whole poaching and/or setting up blinds near fence lines type behaviors. I don't have a dog nor deer in this hunt, just things I've observed and if I'm off base, feel free to chime in)