ad naseum the problem lies in definitions. What you feel is reasonable is far different than what I feel is reasonable and so on and so forth for every individual out there. When you try to limit constitutional rights the standard is very high. Such as freedom of speech there are only a few examples that are not protected such as yelling fire in a crowded theater.  The crime bill from 1994 to 2004 that banned so called assault weapons was shown statistically to have no impact on crime.  The cities with the greatest gun control also have the highest crime rates this shows at the very least that gun control is not effective and in the worst case it shows that it actually increases crime.  
The gun control crowd is lacking on facts and relies heavily on emotion when trying to justify why they want to curtail others rights. Also most will admit that their end goal is total confiscation of weapons. History has also born this out such as Nazi German enacting gun control.