There are so many aspects to this shooting I don't know where to begin. But I do know more laws about guns or gun parts will not work because criminals do not care about laws. I also know that it has been proven time and time again that the only thing that will stop a bad guy with a gun is a good guy with a gun.

Mr Yoo, I see no problem with killing our enemy what concerns me is the scope of how we define the enemy and then prosecute the killing. Since WWII we have allowed Congress to get out of declaring wars, and that has introduced specific problems, government dysfunction and corruptness.  

And if these terrorist are "illegal combatants whose very resort to force is illegal", that places us in a dilemma. If this is true then it becomes a "legal issue" and a court must decide the fate of the combatants and not the military. Under this definition if we have a treaty with the home country the enemy combatant must be returned to their home country and tried as terrorist by their own courts.

Because we are a nation of laws and rise above the terrorist mindset American citizens should not be the target of a military execution based on the opinion of one individual. The POTUS has been granted no authority by the Constitution to carry out the targeted killing of American citizens,  you can't have it both ways. 

IMHO the reason University cost are out of control is because institutions of higher learning have become self-serving bureaucracies. In addition instead of working longer hours they want everyone to start at 9 and be home by 5. The answer is not building more buildings and working less, it is about the utilization of resources and working harder.  

So Mr. Yoo thinks taxing them heavily is the answer. I can never understand why smart people think criminals will obey laws or pay taxes. How will a tax prevent a criminal from obtaining a firearm? In fact any additional cost or tax will prevent those that need firearms the most from having them. 

Firearm ownership is serious business and should be approached in a methodical honest way. First decide if the purchase is only for home defense or you have a larger goal of full time self defense. Next decide how much time you are willing to devote to the art of defense. As with any commitment a minimum amount of time will be required and safety cannot be taken for granted. My best recommendation is to go to a range that have various firearms for rent and a qualified instructor to help you along. After your purchase take as much training as time and money allow.