Physical Danger
Rugby has a well-deserved reputation for being dangerous. It is, after all, the sport where players cover their ears to prevent them from being mutilated or ripped off (source).
The most common injury is not, however, ear-related. It's actually just good old-fashioned spraining and bruising, followed by fractures, concussions, dislocations, and lacerations (source). Because of all the tackling they do, rugby players suffer a lot of neck injuries, along with sprained ankles and broken collarbones.
They don't wear helmets either, so they need to be careful to keep their noggins in the clear when tackling…but 5–25% of the injuries sustained during practice and play are head injuries (source). That's a lot.
The bottom line is that rugby is dangerous enough when you have proper training. If you think your coach doesn't know what they're doing, get the heck out of there. No scholarship is worth risking your neck…literally.