Im saying that the original RCID charter was flawed from day one. (In my opinion)
is it true that the state of Florida bent over backwards so hard that RCID/Disney was even given the right to build their own international air port...and their own nuclear power plant?? C'mon!. If that is correct....that is just a photograph as to how crazy Florida's mindset was in the late 1960's. I feel like Florida sold their soul to Disney back then.
Perhaps flawed by today's view, and your opinion, but I don't really think so for that time period in Central Florida.
At that time it was a pretty barren area where people passed thru on their way to the beach. The population of Orlando was around 250,00 then vs 2.1 million today today. In Kissimmee, just south of WDW property, there were around 6,000 residents, compared to over 600,000 thousand now. The Orlando airport (MCO), was still operating as a military base and didn't become a fully civil use airport until 1975. So, allowing them the option of building their own airport was considered to be a great option since there wasn't a good civilian airport in the area at the time. Also, it should be noted, the original charter did not specifically state "International airport", just "Airport facilities".
"Airport facilities" means airport facilities of all kinds including, but not limited to, landing fields, hangars, shops, terminals, buildings and all other facilities necessary or desirable for the landing, taking off, operating, servicing, repairing and parking of aircraft and helicopters, and the unloading and handling of passengers, mail, express and freight, together with all necessary appurtenances and equipment and all properties, rights, easements and franchises relating thereto and deemed necessary or convenient by the Board of Supervisors in connection therewith.
As for the nuclear facilities, again you must consider the timeframe. Nuclear was still very new and a viable option for future power demand. The inclusion of allowing for nuclear fission was included as well as other new and experimental sources. Keep in mind, the area was mostly undeveloped farmland or swamp/bog that was considered unusable for most industrial or even residential purposes.
Disney came in offering to develop it themselves at no cost to Florida taxpayers.
Public Utilities.-To own, acquire, construct, reconstruct, equip, operate, maintain, extend and improve electric power plants, transmission lines and related facilities, gas mains and facilities of any nature for the production or distribution of natural gas, telephone lines, plants and systems and other communications systems of any nature, transmission lines and related facilities and plants and facilities for the generation and transmission of power through nuclear fission and other new and experimental sources of power and energy; to purchase electric power, natural gas and other sources of power for distribution within the District; and to develop and operate such new and experimental public utilities, including but not limited to centrally distributed heating and air conditioning facilities and services, closed-circuit television systems, and computer service and facilities, as the Board of Supervisors may from time to time determine.
Quotes are from the original RCID charter, available
here. I would encourage you to read it for yourself, but keep in mind this all occurred in the mid 1960s, just a few years after the success of Disneyland. Things were much different then. It's not fair to look back at the decisions made then with today's lens. We can't really comprehend what or why it was done that way unless we stand in their shoes. It's all too easy to judge what was done and say "they were wrong" or "it should have been this way or that". We too will be judged some day by those who come after us, and I'm certain they will question some of the things we're doing.
In short, I think it was a VERY good deal for both Florida and Disney both then and now. It's dated now, and needed to be refined, but overall it's still a VERY good deal for the state. I don't think it's a bad thing for the state to have some involvement in the overall direction, but I think Disney should still have a majority decision on where they spend their tax dollars for their property. And so long as their plans aren't considered harmful to residents and businesses in the surrounding areas or to the environment, there should be minimal oversight by the state.
I've summarized the major points you brought up, but you should take the time to read some of the great books that have been written on the topic.
Married to the Mouse: Walt Disney World and Orlando by Richard E. Foglesong, Buying Disney's World: The Story of How Florida Swampland Became Walt Disney World by Aaron H. Goldberg, Project Future: The Inside Story Behind the Creation of Disney World by Chad Denver Emerson. 
