“The possession of arms is the distinction between a free man and a slave, it being the ultimate means by which freedom was to be preserved.”
There is no more fundamental freedom than the right to defend yourself. Every consequential freedom is dependent on this bedrock as without the basic premise of self-defence you lose the ability to protect every other freedom you cherish.
Since recorded history has begun, certain men have utilised weaponry to harm others for their own gain. Whilst the specifics of the weaponry used has changed over time, the nature of the threat of harm and coercion has remained the same. A small minority of sociopaths will always threaten violence against others to further their own agendas, utilising whatever tools are available in that era.
Today the firearm is the primary tool by which such harm is threatened. For as long as such weapons exist, every man and woman has the right to utilise them for their own protection, regardless, no, especially because others have used such weaponry to cause harm and violence.
There is no such thing as being anti-gun. You either support a gun monopoly in the hands of organised thugs (the totalitarian state and its agents) and common petty criminals, or equal access to all men and women. If only a select few are given the means to effectively defend themselves, you automatically condemn all others to subjugation. The right to defend oneself is not only inalienable from the right to live, it IS the right to live, and your belief and preferences are irrelevant to this fact.
You are either pro-freedom of arms or pro-slavery. No grey area. No middle ground.