1 - Agree, probably very likely that having a gun in the house does not make one more or less likely to attempt suicide.
2 - Disagree.
This study shows 42.2% chance or repeat. I guess it depends on how you define 'often'. This study also shows a much higher rate of 73.7% of people who live in a large family repeat their attempts. Are large families a danger?
3 - Possibly.
4 - Disagree. Guns probably have a very high success rate, but so do other methods.
5 - Meaningless stat that means nothing other to inflate the 'dangers' of owning a gun. Do you really think anyone who buys a gun looks at the suicide rates with firearms to determine if they should buy one or not?
These stats oversimplify the issue to the point that they are meaningless, no matter how much you try and place meaning behind it. And putting suicide into the mix only inflates the numbers to make guns look bad but in reality have absolutely no meaning to ~99.999801% of gun owners (~
100,000,000 gun owners,
19,990 firearm suicides.
Even if I were to go so far as to agree with you 100% (which I don't), it doesn't matter. The stats have zero meaning in any real practical terms.