Concealed carry and open carry, whether lawfully or unlawfully practiced, was not an apparent factor in the Parkland tragedy.
That they're unrelated to a culture of violence and gun obsession and mass shootings is a ridiculous claim, at least a null hypothesis. Maybe it's proven that these are unrelated, and then that's ok, but we as a nation have serious difficulties figuring out what is right and what is wrong regarding guns.
Maybe you've seen, and if so you probably have a reasonable response, to the question of arming school teachers, etc, which POTUS proposed. He suggests that if as many as 10%-20% were armed this would deter shooters. (I am not confident about this, but that's common rhetoric I understand.)
You may also be familiar with a case in MN, in which a school employee, who was lawfully carrying a concealed weapon, was shot a traffic stop.
If it's not a clear cut case to trained police who is a danger and who is not, how are we supposed to believe that regular citizens, especially teachers who are already engaged in two extremely taxing activities--teaching the mind and counseling the emotions of young kids--should also be employed as first responders?
From a cultural standpoint, here in a America we're very bad off in the head. We're not going to reach any good resolution if protecting the "civil liberty" of weapon possession is paramount to protecting the right to "life, liberty, and the pursuit of happiness."