criminals than there are instances where legal gun ownership has resulted in suicide, murder or accidental death, so the whole 'Only criminals will have guns' thing doesn't stand up, since the legal ownership of guns is effectively causing criminality.

The vast majority of mass shootings in the US (of which there are a horrific number - far more than most of us realise, in fact) are carried out using legally-owned firearms. No legally-owned firearms, no mass shootings.