Also important to note a few things about this data, the frequency which people carry and the likelihood of the shooting happening in an area where one isn't legally allowed to carry.

According to this https://checkyourfact.com/2018/03/05/fact-check-what-percentage-of-americans-have-concealed-carry-permits/

Just 6.6% of Americans have a CCW permit. Some do also open carry, but the number can't be that much higher, and not all of those people even carry regularly, some only do sometimes, let's call it a generous 10-12% carry regularly. Even at 10%, that isn't very many, you're more likely to not have anyone armed around you.

Especially considering that most often, the type of mass shootings we're talking about are public mass shootings, not mass shootings at someone's house party that are gang related. Clubs, bars, schools, theaters, concerts, etc, are by and large areas where you're not allowed to carry. Even some stores like walmart prohibit carrying guns inside (and have had shootings before.) This is also going to lessen the likelihood that someone will be armed to respond. Depending on sources the numbers of how many mass shootings take place in said gun free zones varies wildly. If we're cutting out robberies and gang activity, John Lott at the Crime Prevention Research Center puts the number at 98%, if we're including the gangs, drugs, and robberies, Everytown puts the number at 10%.

For an armed civilian to respond, one of those 6.6% of people has to be legally allowed to carry, and have happened to bring their gun today, and even then they still have a gunfight to win they can easily lose. 22/433 is 5.08% of times an armed civilian was the one who stopped the crime, at 6.6% or even 10% of people carrying, I'm gonna say 5.08% is not that bad and the number could go up if more sane people would carry and be ready to save themselves and others should the need arise.

Gun rights aren't for stopping active mass shooting events. Gun rights are to protect yourself and you small circle of family because the police are always too far away.

Active shootings are bad for regular people to try to stop because usually those people who do, end up being killed by the policemen they finally show up. A regular guy with a gun can never be expected to rush into a school to confront a shooter.

A regular armed citizen will be charged with a crime if they stop a school shooter or any other spree shooter in a gun free zone.

This data is disingenuous because they are plotting a unicorn event with a normal event to prove that Unicorns aren't helpful. The question doesn't make sense.

That's how you don't do infographics.

If we tried to meet in the middle, what could help more gun owners be responsible gun owners?

What we know about that recent school shooting is exactly the counter case. There’s no indication the parent was bad. Apparently the kid had some issues and the system and his parents failed him. However, how do you gift a kid an AR-15 and let him use and store it unsupervised? Especially how do you do this after a police visit that the kid made threats? There’s a lot to think about for this case but an important one is how did the parent think this was ok? Much more often than “good guy with gun” is “parent gave kid unsupervised use of gun”.

Clearly trusting that such a large population of gun owners are all responsible gun owners, is not working. Can not work. Can not work and too many people are being killed. Holding the parent responsible is a start but doesn’t make up for the lives lost, plus we want to prevent it, not just ruin more lives