@Rylin Do you know the shaken baby syndrome? It's the fact that a baby was shaken suddenly or too violently (probably for a certain period of time) It's not about bumpy roads or whatever, it's about willingly shaking a baby to the point it would endanger it's life.
In such cases a lot of them are men. Husbands. Impulsively uncontrollable men are dangerous, any gender like that are but gosh why is it always men?