Walk on by...

It seems odd that the MSM should be surprised that 2/3rds of us would walk on by if we witnessed a group of teenagers drinking and verbally abusing passers-by in the street. Unfortunately that's the type of society we now live in, where teens have been brought up to believe they are untouchable, after all, they have been brought up to know that adults can't touch them nor it seems criticise them...
BBC.

Two-thirds of the public would walk on by if they saw a group of teenagers drinking and verbally abusing passers-by in the street, a survey suggests.
Only 6% of the 1,784 people in England, Wales and Scotland surveyed by YouGov said they would definitely intervene. A further 21% said they probably would.
The think tank Policy Exchange paid for the survey and called for "citizen police academies" to be set up.
They could offer lessons in making citizens' arrests, it said.
The survey found that, among those questioned, people in Scotland were the most likely to step in, while those in London were the least likely.

The reasons, though not stated being that many of these teenage gangs would be likely to set about anyone who interfered and/or spend time making their lives a misery by constant hounding, vandalism, abuse etc. should they know where the adults live knowing fine well the police and councils will do sod all about it...
Social engineering by politicians and other do gooders in the UK has brought about a feral class of teens who know no restraints save what their own peers and gang culture will permit and any outsiders simply do not count. Not all teens by any means, but we have created a society where their rights appear to transcend all others, at least in the teens eyes anyway.
So now most adults will ignore a group of teens misbehaving and the media (and politicians no doubt) are surprised. Nor would adults being trained to deal with confrontation be the answer, I suspect only the knowledge that if they stepped out of line society would come down on them like a ton of bricks might work, though those days are now gone.
Those with any sort of moral authority (police, doctors, teachers) have now pretty much removed themselves from the areas in which they work, not that I blame them. However society will not change unless this issue is addressed, you cannot give one section more or less immunity from facing the consequences of their actions and expect it to grow up and mature in a manner that is civilised and tolerant.
You need to start as you go on with action bringing a just and fair reaction, sadly this does not happen and we have a situation now where a sort of siege mentality has built up in adults who would rather ignore bad behaviour than take the chance it will spread the them and theirs, because the powers that be have pretty much allowed it to develop over the last few decades.