First, controlling access to schools and other facilities has been conveyed in parts of other posts and comments, so thank you for bringing it up! Although I am not an expert in the subject, I thought this idea deserving of its own post. My take is, it is a good starting point for larger talks around security and should probably be discussed during planning as a mitigation technique. I do not believe access control means developing a standard for armed guards at every door, but generally encouraging each school, institution, and house of worship to think about how they can use controlled access point(s) as another deterrent.
Idea No. 1239