So, a person or person(s) unknown, can under the 2nd Amendment go into a sporting goods store (Big 5), or a Walmart type establishment or Gun Store and purchase a Shtotgun, Bolt-Action Rifle or revolver or a Semi-Automatic Pistol or Semi-Automatic Rifle and that is all kinds of fine, well, right and good.
That same person, cannot however get on an air-carrier and travel from city to another , from state to another. Which under the 1st. Amendment is an violation of their Right to Freedom of Assembly.
You are more than willing to allow possible terrorist to purchase a firearm because of the 2nd. Amendment.
You do not want that same person to travel because they might be a terrorist.
A possible terrorist can purchase a firearm and you want them to do that. You would allow them to do that. You would by your own inaction encourage them to do that. But at the same time because their name is on a list of possible terrorist suspects you do not want them to get on an airplane.
You would then blame President Obama if that happened.
Clear as the muddy water you drink.