It’s that the force of the impact is concentrated onto a single point. (Specifically the corner.)
Also, kids exist and are more likely to not be seen, shorter doesn’t much help them.
Being shorter is one thing, but that’s just a whataboutism. The design of the CT is broadly unsafe, from drive by wire systems that insert delayed control signals, to shitty suspension that can’t handle hard and sudden braking under any kind of real load, to tires that get cut by its own hub cover, to lethal body panels and being ridiculously heavy.