None of those say anything about your flawed mathematics. Establishing a correlation line out of hundreds of data points only works if those data points are sufficiently uniform. But you are saying that the relationship between each and every nation is equally important.
No. America has far more guns and gun deaths than any other Western nation. I don’t need to contrast Belgium with New Zealand to work that out.
If you criticise other methodologies but do not accept the flaws in your own, then Jesus had some advice for you. Thou hypocrite, first cast out the beam out of thine own eye; and then shalt thou see clearly to cast out the mote out of thy brother’s eye.