The principal reason for this is that lots of us here in Europe neither want, nor need them.
This makes no sense at all. Even if you don't want them, if Europe wants to continue running its economy on car exports it doesn't take a genius to see that developing your own driverless system might be useful. Further, there are plenty of uses in Europe beyond personal transport (e.g. long distance trucking) where a working self-driving system would be useful. There are loads of trucks criss-crossing Europe. The idea it is a public transport utopia is myopic.
Perhaps even more importantly, autonomous driving is just part of the development of automation stacks in general. The technology pioneered by Waymo etc will be useful for many other automation tasks. Things like SLAM/perception algorithms, simulation training etc would all be really useful for any next gen robotics (not taking stuff like humanoids, just all sorts of task automation). That's a good enough reason to pour money into the field even if you want to keep driving your own cars.
As someone living in the UK, honestly, the trouble is that Europe is so conservative when it comes to investment. To get money you have to find some rich aristocrats, and then plead with them to stop investing in expanding their stupid property empire and give you a bit of money. If you then fail to deliver, or they get cold feet, they will demand their money back and an official inquiry as to why you failed. Then they'll go straight back to stuffing their money into property investments again and tut tut about how risky all this fandangled tech stuff is.
Further there is just this persistent belief outside FAANG that someone who monkeys around on a computer all day couldn't possibly be worth paying banker sort of wages. So the smart tech people go into finance or work for a US company, while the average ones work for local companies for what are frankly insulting wages. This then reenforces the idea among the local companies that engineers aren't very good, so they refuse to pay more, further destroying their ability to get good engineers. If companies tripled engineering salaries here, they would suddenly find a whole lot of very competent people move across from finance.