'so maybe those that have benefited from the help of S/H and councils and are now on their feet should move on to private rent or purchase a property,why do they feel they have a right to stay for life.'
The problem is that they are not 'on their feet'. They are in receipt of HB, because they are unemployed, under employed and/or disabled.
And, well, I've spent time on this thread explaining. Private landlords often cannot or will not accept tenants on HB, for a number of reasons the chief of them being that often times their lender forbids them from letting the place to tenants in receipt of HB. And, when they can, the caps are greater than the HB the tenant would receive if in a council/HA property, so there is even greater expense for the government.
And these are the ones who are not disabled and require a property suitable to their needs, often that have been modified at council expense: ramps, hoists, doorways and worktops to accommodate wheelchairs.
Anyone over 61 is exempt, regardless of their net worth or work status. Anyone who pays their full rent can stay put.
So we are talking about the most vulnerable people already, not people who can swan off to a private rent or purchase a place.