He knows the importance of image and says all the right things to tug at your heart strings... they're fighting global warming, they're helping single moms, and they're running a startup-like environment unlike the other big evil corporations.
What planet are you on? Truck driver is an excellent working class job. It's skilled labour (yes, really), you need to be trustworthy and able to operate independently, work long hours and take responsibility for a very expensive asset. As a result it pays a significant premium compared to a lot of manual labour and service jobs.
Bezos does not give a flying fuck about the wellbeing of his workers, both in the warehouse and in engineering.