The HDI chart is in this article, and still has no correlation:

The Magic Gun Evaporation Fairy

The suicide issue is unpacked in depth in this article:

The Left Is Making the Wrong Case on Gun Deaths. Here’s a Better Case.

Your third point doesn’t make sense. If an effect is there, it should be there, at least at a multivariate level.

I don’t object to legislation changes, but the changes need to be made based on reality, not freakoutery and emotion.

The Gun Solution