Did those "much younger children" or children the age of those in the original post go to those "pro life" rallies on their own volition? Do you think they even cared apart from what is told them by their parents?
The same holds true for the anti-gun rallies. Those teachers most likely took class time and gave those students instructions about making the best protest sign against gun violence then marched these children out of class and out of school into the streets.
Just like parents march their children into pro-life rallies. Both are pathetic attempts to use emotional manipulation, "think of the children."
Name just one mass shooting or school shooting that could have or would have been avoided by anything you mention in this meme: reasonable limits on types of guns and universal background checks.
Do you mean confiscating all of the existing "types of guns" that are to be reasonably limited? Because that is what it would take to get rid of the guns of that type which already exist.
If you had ever tried to purchase a gun from someone who was not already breaking the law you would know that background checks are already mandatory and stregent.