Indeed....the fact was that the Miners were not universally supported by the public, in fact the majority were against the miners, increasingly so the longer the strike went on. The Miners also did earn substantially more than the majority of people not in the mining industry (and like the Tube Drivers, were consistant in demanding ever increasing percentage rises), the tactics employed by the NUM and its members were widely seen as both inappropiate and irresponsible by the public and many pits were indeed closed shops where if you did not have a family or Union member already working in the pit then you were extremely unlikely to get a job or apprenticeship.
Dimple is essentially correct albeit anecdotally, for example the Miners accepted a 9.3% pay increase a year before the strike despite the NUM calling for Strike Action for more, the NUM was one of the most militant and powerful unions in Europe and the Coal Industry was in steep decline (like the Steel Industry before it) and the taxpayer could no longer subsidise huge losses in unproductive mines. The claim that Miners could (and did) earn millionaires wages is also not too wide of the mark, in 1983 a Miner could (with overtime) earn up to £600-£800 a week...this in a year when the average weekly wage was around £100, to a fella on £75 a week, coal miners wages would seem like a millionaires salary....British Coal made a loss of over £700m in the year before the strike, equivalent to £1.4bn today...this was clearly unsustainable. Something had to be done and uneconomic mines had to be closed. The NUM called a strike (even without ballots) and subsequently many pits were closed, not because they were unproductive, but because the NUM tactics forced the engineers to stop maintaining the pits so they became unviable and dangerous. The Govt wasn't the only agitator in this, Scargill and the NUM need to face up to their proportion of the blame as well.
Having said that, it was clear also that the pit closures without significant investment in other industries would mean a steep decline in mining regions, and the govt failed to address this, leaving many communities still feeling the effects today.