The "RailUK Standard Minority" is a response that, quite frankly, is getting rather boring and it gets trotted out rather too often on the forum.
Agreed on your first point. On your second, don't you think that you're being a little bit over-dramatic? I'm not suggesting that those crimes don't happen at all but they're very rare. In any case, I suspect that most reasonable bus drivers will weigh up the pros and cons of kicking someone off the bus before doing so; dropping someone off in the middle of nowhere on a rural bus route has its risks, but those are likely to be from other traffic more than anything else.
To add to this, most kids carry mobile phones now and it's easy to share their location with a parent or guardian who will probably come and pick them up. If the family doesn't have a car then it's a little bit more of an unfortunate situation, but a long walk home might focus the mind a little bit.
Sorry, but this is nonsense. How "built" someone happens to be is utterly irrelevant if you're an individual facing a gang of people. Indeed, there are some who would probably see a bigger guy as a challenge. That's before we contemplate that someone in a gang of thugs may be carrying something sharp and pointy.
There's nothing to disagree with in the points that you make here, but the problem is resources: who pays for it? Arresting and booking someone into the cells takes time and means that those officers are tied up while the processing is done, the closure of local police stations means that the distance to the cells is greater and that assumes that there's enough capacity in the cells to begin with. Add to that the fact that the courts are backlogged as it is.
It might be an idea (and cheaper) to spend money on things like youth clubs and sports facilities in order to prevent anti-social behaviour, rather than having to deal with the behaviour itself. This is definitely a subject for another thread, though.
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"Bus Bouncers" is certainly one idea but, again, who pays for it? Having one on every bus would be prohibitively expensive (you might as well bring back conductors) and only having a few would mean that they often won't be in the right place at the right time.
One answer could be technology. I don't know if existing ticket machines already have such a facility, but perhaps there should be an ASBO (Anti-social behaviour observation) button which, when pressed, would record the time, date and the location of the vehicle. These reports could then be analysed, along with CCTV from the time of the incident, to ascertain if there's a specific pattern of behaviour, particular individuals/groups or if there are certain geographic hotspots. Resources (police/security) could be targeted at those areas or routes accordingly.
I'm not sure how practical this would actually be but an ASB reporting function could even be built into operators' apps so that other passengers can report issues that perhaps the driver hasn't noticed. There would obviously have to be safeguards to ensure that this isn't abused: "Dear Mrs Jones, thank you for your recent report of anti-social behaviour on the number 2 bus last week. While we agree that the colour of Mrs Smith's coat is indeed "boggin", it is not in breach of our Terms and Conditions and we will not be taking any further action..."
One other solution is signage. I had a look at the conditions of travel for First and Stagecoach and it's already written there that use of loud things isn't permitted, but I haven't noticed any signs on my local Stagecoach buses encouraging people to wear headphones; a few stickers reminding people wouldn't go amiss. How many people are actually aware that vaping isn't permitted? It's pretty much universally known that smoking isn't allowed but vaping is not the same thing.
All of this needs a bit of joined-up thinking, though. We need to have penalties that are severe enough to deter but we also need to ensure that those penalties are actually applied if someone is caught.