Re: seems reasonable ... But I think you are wrong..
What happened to weaken the funds was mainly a change in the method of valuing assets at 3 year actuarial valuation time; from value at time of purchase to value at the current market rate at time of 3yr valuation.
This method produced sudden surpluses from long-term held stocks and shares that were now at a peak market. These surpluses (upper and lower limits now dictated by HMRC) were then used a s an excuse for further company pension contribution holidays and the sops to the employees of 'future' increased benefits (as yet 'unfunded') When the markets then slumped the funds began to slip into deficit and the companies became unwilling to pay the increased funding. (By not paying contributions the companies were saving in the region of 10% of their payroll. )
So, in the main, companies decided not to continue contributing (particularly as their 'future ' increases in benefits for employees would require additional contributions) and to offer poorer schemes contributing say, only 5% of payroll...
In effect, .. a pay cut all round... and a worse future pension scenario for one and all....
** Oh, and as for taxpayers' money being spent on a bail out - I seem to recall the government of the day proposing a levy on all the other schemes to pay for bail-outs... another nail in the pension coffin if it came to pass, and, less obviously to some, a significant burden on a future government when these particular pigeons come home to roost in the future**