You're not wrong, but rate of pension fraud (ie pensioners committing benefit fraud by lying about their personal circumstances, not people ripping off pensioners) is massively, massively higher than the rate of disability benefit fraud.
Whenever there's a thread about disability benefits on MN it always turns into "well some people fake disability to get benefits" but people are ignorant of or choose to ignore the facts.
Look at official government statistics on benefit fraud for any given year, the statistic for how many claims for disability benefits are proven to be fraudulent is between 0.2% and 0.5%.
Around 90% of all cases of suspected disability fraud that are reported to the government are proven to be groundless (ie the person who was reported actually was disabled and had not lied or committed any fraud).
The amount of money the government spends investigating malicious false claims of disability benefit fraud is something like three times more than the government makes penalising the 0.2% who actually do commit disability benefit fraud.
And malicious fraud reports don't just cost the government millions, they can also severely harm disabled people, whose benefits are sometimes stopped during the course of the investigation, leaving them without any income. (If they're found not guilty, which 90% are, they receive backdated benefits for the time period their benefits were stopped, but that doesn't exactly help if you've already been evicted for not paying your rent, or had to go without food and medicine.)
On the flipside if you look at official government statistics on benefit fraud for any given year, between 2%-3% of claims for state pension are found to have contained fraudulent information.
Factually, elderly people are massively more likely to lie on their pension application in order to commit fraud, than disability benefit claimants are.
Yet the right wing tabloids and TV shows constantly push this (completely inaccurate) perception that people are just faking disability for ££ left right and centre. When was the last time you saw an article or TV story about an elderly person stealing money by lying on their pension application? Never - because elderly people have the highest voting turnout, so no political party dares to target them. Disabled people are considered a good target for being made a scapegoat so the Tories can pretend our country's financial problems are due to horrible lazy scamming disabled people on benefits, when that simply is not supported by the facts.
Funny how there's never a thread about pensioners committing benefit fraud, huh.