"Since a good T&T thread evolved into a policy discussion, then why wasn't it simply moved to the appropriate forum rather than just closed."
Because there is no General Public Policy discussion board at TFL.
Law and Civil Rights is not the forum for wide-ranging discussions of public policy, and it certainly isn't at home in any of the other forums here.
"The gift which I am sending you is called a dog, and is in fact the most precious and valuable possession of mankind" -Theodorus Gaza
Baby Jesus cries when the fat redneck doesn't have military-grade firepower.