The modern establishment has shown itself unable to protect us from crime and urban decay
Murder rates have been going down over time as has many other types of crime in the US (see e.g. here and here), which seems to be where you are implicitly focusing. This is also true for many other developed countries. There's a lot of question of what is causing this, from legalized abortion, to reduction in lead levels, to improved emergency care, to improved policing, to higher incarceration levels. One can make strong cases for all of these but one would suspect that the vast majority of the change is really just one or two of them since it is highly unlikely that all different causes would be sheer coincidence move in the same direction.
But the cause is incidental to the primary issue: the claim here (and most of the rests of the claims in the paragraph in question) seems empirically false. You need at least some sort of evidence otherwise it looks like generic pessimism and inaccurate nostalgia.
I cannot make a strong case for any of those five causes of falling crime. Indeed, I can do no other than make a strong case against all of them (except the fourth, because it is underspecified). The first two hypotheses predict a stronger effect on younger people than older people. The third predicts a uniform effect across ages. If the fifth theory is about deterrence, it is also uniform; if it is about incapacitation, it predicts and effect on older people.
The fall in homicide is partly due to the population being older and partly due to older people be...
An article by Nyan Sandwich on More Right.
This is the section that I am particularly interested in discussing, building better models of this has clear consequences for futurism as well as ambitious effective altruism: