Bonds with negative yield - I'd call it an open scam. Why on earth would you pay someone to hold your money for 1, 10 or 30 years? Why not just keep it yourself? If your neighbor offered you that deal, you would never take it. It's insane, but for a reason. Because they have fucked up after the last crisis. At least that's my take on it.
If I speak for where I live, I know why they want to continue with the madness. If they raise interest rates our housing market will crash. And that would put our banks in the shit and from there, who knows..,
On this topic, I have a tip. Recently I came across a place called Realvision where they have had some really interesting discussions about financial matters. Check it out on youtube if you have any sort of interest. I can't claim to know what they are talking about all the time, but I am fascinated by the data and the discussions. It's far more advanced than anything I have seen before.