Ah yes that slippery slope to personal responcibility, which lets face it... Is a bollocks word when you use it because you want personal responcibility without accountability.

Most criminals who commit firearm offences get their guns from friends and family.... A national register would enable those to proide guns to criminals to face personal accountability for their actions. But then that would be bad for the gun manufacturers, and therefore bad for the people you let do your thinking for you