One problem with the majority of those facts: America has a population of ~300 million, most European countries have exponentially lower populations. For this reason, straight number comparisons do not work- percentage-wise stats are a lot more accurate and if you look at those you will see even in nations of high gun control, the numbers are very similar.
That brings me to the second post in which one of the points is that most gun crimes are not punished. The reason for this is often related to the fact that our jail system is simply overcrowded. Perhaps even more important though is the fact that most of those gun "crimes" that are listed such as trafficking, etc. are the result of criminalizing gun ownership, which have led to black markets. It is often the best interest of police officers to not take down parts of black markets because that usually results in violence among competitors who fight for that market share. The prostitution situation in Chicago shows this very same thing, where according to statistics in a recent (few years old) study, a police officer is more likely to sleep with a prostitute than to arrest her or a pimp.
Now we are at the point where 1% of gun stores sell to 57% of gun crime criminals. The problem with dealing with this is the black market will always support that demand. If you don't buy into that argument because you still dream of utopia, then consider pushing legislation that would further regulate those stores- don't talk about overall bans because of a few stores. Same goes for gun shows.
As for stolen guns, what do you say we do about that? You yourself said that you are for gun ownership, just not public carrying. Most people who steal guns don't do so when a person is carrying them (that'd just be dangerous and stupid

)- they do it from private locations.
And as for youth getting guns, that is currently illegal by law first of all, but in any nation that allows gun ownership, it would obviously be easy to an extent as people would have them in the homes their children also live in.
Those statistics are very misleading and they seem to advocate for complete gun bans anyway. I thought you are ok with private ownership, just not public carrying?
Edit: Also, if you could give a link to where you got those stats from that'd be nice- always give credit to those who did the work, no matter how misleading it may be
