Why are speech pathologists more often injured or ill than ambulance drivers, police officers and freight agents? That does not at all match my idea of that line of work.
Because speech pathologists are generally working with patients that have mental issues, speech issues are generally neurological, and those patients may not have the same emotional self-regulation and self-control as the average person and may act violently.
That said, I wouldn't consider it a particularly "dangerous" job. It's just that, despite the popular discourse, jobs like being a police officer are also really not that dangerous either. When the effect size is small it doesn't take much difference to be amplified in the data. Being a roofer is far more dangerous than being a police officer, even though that's not the typical mainstream narrative, as an example.