Final answer:
Bus passengers are often injured due to collisions, sudden stops, unsafe boarding/exiting procedures, or societal tensions, as seen historically during the Civil Rights movement.
Step-by-step explanation:
When bus passengers are injured, it is usually because of collisions, sudden stops, or unsafe boarding and exiting procedures. For example, passengers might sustain injuries if they board a bus while it is moving, similar to what can happen in Cairo, Egypt, or get hurt during the rush and push of entering an overcrowded train in Mumbai, India. Situations like the historic event in Southern bus systems, where segregation required African Americans to reboard at the back of the bus, increase the potential risk of injury. Moreover, societal behaviors where a person shoves past others to board, as one might unfortunately do to an elderly woman, could lead to accidents and injuries. The challenges faced by freedom riders in places like Anniston, Alabama, where violence during the Civil Rights era resulted in injuries, is an extreme example of how societal tensions can escalate into physical harm to bus passengers.