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1) Some documents could put public safety at risk, therefore would negatively impact people in our nation.
It is an important feature of democracy that the government be held accountable for its actions, which would be facilitated by making government documents public.
Corruption and bribery might be prevented easily
2) Espionage would become a terrible problem.
That will never happen because it leaves a governing body open to attack by the masses. Even if it was made policy, there would still be off-the-books meetings.
There would need to be protection for the military (ie, location of troops). An amendment to the statement such as "except where it would directly endanger lives" would be useful
Because the ordinary citizen needs to know what is in Area 51! You can't hide dem aliens!
Revealing the truth about the reptile people at the top of our governments would cause them to initiate their genocidal plans early
This could take millions of years to achieve given the scope and rate of publication of U.S. government documents