The stuff about pensioners being more deserving, all having paid in etc, would completely miss the point even if it were true. Which it's not.
For one thing, we don't have tax systems based on how hard a person has worked. Quite the opposite. Someone on NMW would have to work over twice as many hours as me to earn what I do, but the tax system wouldn't recognise this. Unearned income isn't taxed at a higher rate than earned income. Sometimes the opposite!
But also, even if every pensioner had contributed, however old a person is now and however much NI they may previously have paid, it wasn't enough for us to fund a suitable care system for an ageing population. This means the extra money to pay for one now is going to need to come from somewhere.
It's a fact that pensioners as a cohort are one of the groups with higher income and more assets. We simply don't have the luxury of allowing those of them with sufficient funds not to be included in the new plans to pay for care. The working age population can only be squeezed so far, regardless of what anyone thinks is ethically justifiable.
Not that I trust the Tories to actually funnel any proposed NI increase towards social care in the first place, but sooner or later we're going to have to do something.