That's because it is the category in which they reside.
You wrote:
1) Bad guys shoot bad guys.
2) Bad guys shoot good guys.
3) Good guys shoot bad guys only when it’s necessary.
4) Good guys don’t shoot other good guys.
Bad guys don’t obey gun laws, only good guys do.
Therefore, gun laws will have no effect on 1), they will increase 2) and reduce 3). 4) is not a problem either way.
3) is the only category Liberals care about. That’s why they want gun control.
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Nice list and analysis. But you left out the most important factor in ruling class thinking. Good guys might shoot members of the ruling class. That constrains the ruling class, even if a shot is never fired. Constraining the ruling class in any manner is unacceptable.
There’s a reason only nobles were allowed to have armor and swords and why peasants had to use pitchforks.