You have to defend some cruel policies that have had no benefit, such as austerity
Austerity may have been unpopular, and with some good reason given its impact on lower income families, but it didn't have "no" benefit either. The Tories inherited the largest budget deficit of any European country hence the "there's no money left" note.
From a macro-economic perspective, Osborne succeeded in moving from a surplus to a deficit on the current budget and, before Brexit, was on track to reduce national debt as a proportion of national income.
I agree that the pandemic subsequently blew a hole in public finances and dwarfed the impact of austerity measures. But there was an underlying economic rationale for austerity in terms of trying to stabilise the economy and, to some extent, match spending with public income.
It's not the only approach, but having a huge public debt has to be tackled at some point, either by increasing taxation or cutting spending. The pandemic has made this problem far worse and there will be some very difficult decisions ahead. And yes, I absolutely have sympathy with people struggling to put food on the table and pay their energy bills.