Kaylee is demonstrating the fundamental attribution error while attempting to explain the man's behavior.
She decided to base her opinion on this man simply based on what happened and she didn't want to take into account what was going on behind the scene. In this case, the man's breaks have failed and that was the reason why he drove through a red light, almost crashing into Kaylee. She just assumed he was a reckless driver when that wasn't the case.
The answer for this question is that it is symbolic of how
Scrooge feels about humankind. Metaphorical reference to the absence of understanding
and compassion the government has for the underprivileged and the speedy
increase in population/ inhabitants in London.
These are the basics. if you want more just look online