I attended a rough comprehensive in the 1980s. I was lucky to be academic enough to be in the top stream which contained pupils who were self-motivated and wanted to work. There were some excellent teachers there who went above and beyond, but also some who had obviously given up and were marking time to retirement.
I've been trying to remember if we ever had any external speakers come along - I do have a very good recall of my time at school - but I can't remember a single person coming in to talk to us, not even a non-famous ex-pupil. Those staff who cared were fighting a losing battle. We had pupils who left because they'd been sent to a young offenders' institution; girls getting pregnant as young as the 3rd year. Bullying was rife.
However, possibly unlike modern schools, there was never an illegal drug problem - smoking was turned a blind eye to as long as pupils were reasonably discreet about it, but it was only cigarettes which could be bought singly or in packets of 10 in those days, you were supposed to be 16 but most shops didn't; care.
It was a shame for those staff who cared and especially for pupils who were motivated but not academic enough for the top stream, whose classes were a farce due to constant disruption.
When OFSTED ratings came along some time after I'd left, the school went into 'special measures' and it closed not long after that.
The point I am rambling towards is that many state schools not in 'leafy areas' are left to rot, and that has been the case for at least 40 years, it's nothing new. We need more investment in getting people interested in that type of school, getting external speakers in even if they're successful but not famous, e.g. local business people.