It's really no different with most drivers... You just notice the taxis more because they are all one group that stand out.

I'm pretty critical of taxi drivers but they really aren't any worse than most drivers besides the random stopping without signalling at all. Which, no surprise, non-taxis do a lot too if you take enough notice. Taxis just do it more cause they stop more.

> It's really no different with most drivers...

It is because they drive all day and do this for a living so "cutting corners" (literally or figuratively) will save them... something. A private driver may not find any value in doing this regularly since they may drive 30-60 minutes per day. You are more likely to cut corners in your day job because you know it very well and you feel comfortable doing this, even if it's not safe.

"because they are all one group that stand out"

Like BMW drivers?

Not signalling turns is something that I really don't understand. It requires minimal effort, doesn't slow you down in any way, and significantly increases safety. It's something that should be enforced much more.

There’s a significant fraction of drivers that interpret a turn signal as a sign that it’s ok to pass unsafely because the signalling driver is safety-conscious and will act to avoid a colission,

I’ve heard the argument described like this:

Indicating I’d exactly that: indicating your intention to turn, which is useless information because it causes people to assume they know what you will do.

It’s not an entirely flawed argument.

These people are mentally unfit to take part in motorised traffic. Confiscate their driving licence and return it only when they undergo and pass a psychological examination.

It looks like Tesla AI doesn't take the signals into account, but only the car movements.