I'm sorry but the images at the start of these post are misleading and poor statistics. If you have the time, read through some of this:
https://dispellingthemythukvsusguns.wordpress.com/If not, the gist is that things like careless driving that result in accidental death, or pushing someone who suffers a head injury and dies etc count as homicide in the UK, where the US definition is only for willful murder. So actually you are 4.03 more likely to be deliberately murdered in the US than in the UK. And I can tell you (not from looking myself!) that guns are difficult to get, and only organised gangs own them illegally.
With regards to the 3 images at the start of the thread, here's what I have to say:
1) When you did/do science at school/uni/(maybe even work), you have a dependent variable, an independent variable, and anything else that could matter is controlled. If you outlaw handguns, but there is tension in society due to immigration, or if there is an increase in terrorism, then the experiment isn't fair. In the real world there are so many different factors affecting homicide rates that this is completely useless. A scatter graph comparing homicide rates and gun ownership rates by country could be more useful, although I doubt you'll find one that links higher gun ownership with lower homicide rates. Have a look at this:
https://en.wikipedia.org/wiki/List_of_countries_by_firearm-related_death_rateUK is 0.23, US, 10.64, or just over 46 times greater.
2) You got this from pinterest... I'm not going to dispute the stats, seeing as I can't. I don't know where they got them from... but the third point about how quickly civilians stop rampages... they're the ones who start them. Sure a gun rampage in the UK would be quite bad, there is potential for a lot of people to die, perhaps as many as in Paris. But gun rampages don't happen in the UK. If someone is mentally unstable, depressed, they will seldom manage to kill anyone unless they are very clever or determined. In the US little kids kill their classmates. Also your police force are at times utterly shocking. They go for their guns at the first sign of danger, and kill innocents. It's unclear, but I'm guessing the 11% error rate refers to this... and that's what gets counted as an error.
3) This is just awful. If I took the 4 countries that had the greatest population (China, India, US, Indonesia) and put them up against the 4 countries which have the highest intentional homicide rates I could say that countries with more people have less murders per 100,000 people. That's not a trend, it's a coincidence.
My opinion is that automatic and semi-automatic weapons should be banned in the US, including pistols. Hunters shouldn't care. Target shooters shouldn't care. Those wanting to defend their homes don't need a sniper rifles and M16s. Massacring people with a bolt action rifle will be much harder, and not being allowed handguns means criminals can't hide their weapons. Training your police in how to arrest people rather than just shooting them might be a good idea too.