What you should be criticising is the cut-off point for the WFP, not the fact that it has been cut off for "better-off" pensioners.
Pensioners come with different incomes - some have only the State pension, which may also be at a lower level than average, and some have occupational pensions, or ones which they have augmented by higher payments when they had the means to do so, and some have investments that yield high interests. Yet the winter fuel payments went to all. That had to change.
The chosen cut-off point has been set at the level where people are eligible for Pension Credit, but there must be a better point that doesn't leave some people worse off than they should be. I would assume that the resultant outcry will cause it to be re-assessed and changed in the next session of Parliament.