This has nothing to do with brainwashing. You should just read the fine print carefully and have it checked if in doubt.
The government benefits would be, for example, a reduced earning capacity pension. That is a joke and is rarely paid.
Important with disability insurance, for example, is that there is no abstract referral to other professions.
And I repeat myself: for employees, the salary is usually the only income. If that disappears, financial ruin or a massive decline in living standards may threaten.
But that must be examined individually.
An acquaintance, father of two, by far the main earner, bought a large and expensive house in an unpopular area. In resale, he will never get enough money to pay off the financing.
If he becomes disabled, there will be debts, the house is gone, and the wife would earn an absolutely low four-figure amount working full-time. Half of the salary would go for a 4-room apartment.
Whether he can work at all then is questionable. So the family might fall from wealthy to Hartz IV level through a simple twist of fate.
All this just to save a few bucks.
You can cancel the disability insurance again when the kids are out, the house is paid off, etc. But being in debt with a family, I consider that irresponsible towards my family.