There are 2 things being discussed here:
1. The presence in our society of criminals (in this instance mainly young moped-riding thieves) and what causes these people to lead this life. There is a temptation to try and apportion blame somewhere - schools, parents, social media, drug-taking etc. But the truth is we do not know exactly what is behind all this - we can take an educated guess if we happen to be knowledgeable about social deprivation - which most of us are not. My own take on this is that there needs to be more resources poured into prevention measures, particularly catching the drug pushers and barons, prevention measures improved regarding the import of drugs, family centres for struggling families where the culture that generates young drug addicts can be tackled etc.
I spent many years as a SW in deprived areas of one of Britain's major cities and the seeds of this crisis were clear to see - family support measures and prevention were in their infancy, but held out some hope for these deprived communities. They have now been withdrawn, prevention has been jettisoned and crisis management is the name of the game - hence this mess.
Most of the young people perpetrating these appalling crimes are themselves damaged and vulnerable and easy prey for older criminals and drug pushers.
2. Is the policy of "nudging" these young people off their mopeds and risking their lives and the lives of bystanders justifiable? I think we are right to have concerns about this, and I would guess the police themselves might be uncomfortable about it - certainly they could be placing themselves at risk of prosecution. My personal view is that it is a very dubious policy - not because I do not recognise the appalling nature of the crimes and the need to find a way of preventing these - but because in general we, as a society, have quite rightly turned our backs on capital punishment, indiscriminate use of guns by the police; and I think this policy falls into these categories.
I think it is important to remember that we have also turned our backs on these young people as they grow up, by piling deprivation upon deprivation with austerity policies. Pulling this back now is a mammoth task but is essential - resources targeted at PREVENTION are what is needed. Will it ever happen? - I suspect not. As a society we now seem to prefer a blame culture rather than one that nurtures its children to provide the sort of role models and care that lead to people feeling included in society and able to take their place as decent citizens. Blame is entirely appropriate, but it is not the individual damaged young people to which it should be directed.
The policies of successive governments have to change. Money spent on families, education, social care etc. is money well spent. The education system has to change so that young people with non-academic skills feel valued and valuable, rather than thrown on the scrap-heap while the teachers battle with tests, stats, form-filling etc.
There will always be those who live on the fringes of society and commit unthinkable crimes; the job of governments is to initiate policies that minimise this; not to withdraw support to the most vulnerable.