If the bombers got guns illegally, it is grounds to argue why we don t want tougher gun laws. It would make it even harder for law abiding citizens to get one for self protection while criminals have the means to get one off the street. US needs tougher immigration laws to make it harder for terrorists or people from countries with religious values and political viewpoints that can make them into terrorists or spies. That means the US should allow less Chinese, Russians, Arab Muslims, and Muslims in general from entering as immigrants into US.