In Italy there is a very aggressive law against money laundering: if you withdraw more than 1k cash, it triggers a call to the police. I know it's the same if you do it over multiple days. I think it has been relaxed a little bit later on, but in Italy everybody does the "I'll charge you X less without VAT" (which is 23% in Italy, I should point out), so this is also fighting that.
You mean they implemented laws under the guise of "money laundering". They just want to track what you spend your money on, that's step one. Step two is to restrict what you can spend your money on, although this is a partial side effect of part 1.
Where do people get these ideas? How do they sincerely hold them?
No non-religious government wants to restrict what you can spend your money on. They want to get a cut of your money, but otherwise it's strictly better for them if you spend as much of it as possible.
If they don't want you to have things, they just attack those things directly, like hard drugs or weapons. No need to restrict your ability to purchase.