I suspect some feel empowered by it getting into a pickup and it goes to their head - I prefer driving mine as for some reason psychologically my confidence decreases if I I'm driving a lower vehicle than approx. my normal standing height.
I have my own moments of being inconsiderate and/or driving badly but it is usually unintentional either from inexperience or not reading a situation correctly or at all - having seen what I've seen in the way of serious incidents, some of which were entirely avoidable if at least one of the partly hadn't been driving with no consideration for anyone but themselves, I tend to try and learn from and improve my standard of driving in all situations.
EDIT: On a semi-related note shame I can't de-cat and stick a 3" dump pipe on mine -
https://www.youtube.com/watch?v=QT7tNNx6Hoc just love that bark - it is so much quieter on mine.
I don't tend to drive bigger vehicles (7.5t upwards) myself but work in distribution do the driver briefs/debriefs, etc. and have in the past rode with some of the lorries, etc. makes for some interesting experiences seeing what they have to deal with first hand especially when it comes to road layouts.