[psmithsfhn]

I suspect the answer is, like most things, 'politics'.

So, to me, for instance, take the biggest problem the world currently faces - global heating.

I think everyone knows the two or three things we would need to do to 'solve it': - carbon tax - carbon capture - energy reset/clean/green/conservation/etc.

But it's only partially 'solved', same as robocalls.

There are just too many people making too much money, having too much success, with robocalling to stop it.