Everything from not checking for pedestrians (or cyclists) when turning, not indicating when turning, using a mobile phone whilst driving, trying to squeeze their giant SUV into tiny gaps, changing lanes every 20 metres because they think it will get them "ahead".
There aren't rare occurrences - but things that are illegal - yet the majority of drivers do them (in Sydney), because being an aggressive driver is seen as "normal".
I've even asked friends - one of which has had two accidents related to mobile phone use - why do you talk on the phone? Apparently they consider it a badge of bridge that they're "good enough drivers that they can text and drive"...
And let's be realistic - unless you have a deathwish, most cyclist aren't going to take needless risks. When was the last time you saw a cyclist try and text and ride? Unlike a car, you don't have airbags, or slabs of metal, or crumple zones.
Yet drivers have all of those, and so yes, they do act with more impunity.
Also - when was the last time you saw the headline "Cyclist maims SUV driver in brutal collision"?
However, I absolutely agree with you that unpredicatbility is very bad.
In fact, that's exactly why cyclists ride on the road, and don't weave in/out on footpaths. You pick a straight line, and a constant speed, and stick to it, ignoring all the loutish drivers who beep at you for not riding on the footpath.