I guess these hits to the side are preferable to head-on collisions. A better chance at recovery and probably a lot less damage.
The reason for the hits amid-ships, I'm deducing, is that the roo departs the road edge too late for the rider to see it, so braking isn't an option.
Could be worse- in US it's deer that run onto the road, and their body mass is badly located for bike riders.