I'll caveat this with saying I've name changed.
I have a disability, although am not on UC.
You can do EVERYTHING 'right' and still need support - be it in child maintenance/PIP/employment support.
I'll speak through the lens of disability as that's what I know best. Disability is horrendous. It can be utterly dehumanising, isolating, painful, life-limiting, costly and exhausting. It's not - in my experience - 'queue-jumping' and 'reduced fees at National Trust properties'. It's hospital appointments/intensive care/missing out/lonliness/constant medication. I will not take advantage of the 'treats' on offer (and I say treats loosly as many are merely accessibility/equality adjustments) as I'm too ill.
Similarly, many, many people who've lost their jobs are frantically applying for new ones. Redundancies are happening everywhere. Many young people/older people are out of work not through choice but through lack of opportunity.
A lot of people on UC are so for a multitude of reasons; lack of intergenerational wealth, wages not going up in line with inflation, carers etc. They're not scheming liars or workshy. They're people who need support.
The Welfare State exists for a reason and everyone is a slip, illness, redundancy, lost relationship from needing support.
I think it's really upsetting people can't accept that.