The mother crocodile reacts because she thinks you are going to harm her young in some tangible, concrete way
Most of these "child-protection" measures exist because there is a social stigma attached to adults having sex with children
The former is driven by a biological imperative, the latter is not; it's socially-constructed
In fact, one could argue that the general biological imperative for the male of the species to spread his genetic code far and wide actually explains why many/most adult males are aroused by the sight/thought/presence of nubile teen females, and some percentage of those will, despite the social taboos, act on those impulses.So, when viewed through the narrow lens of "biological imperatives", it's actually more expected that these liaisons occur than for them to be prevented. More "natural", as it were.
(I'm sure those who read this casually, or selectively, will be aghast at the thought that Wowlapalooza is claiming that raping children is "natural". But that misses the point that I'm trying to make here; that viewing a complex, multi-variable issue like protecting children from abuse, from one limited, academic perspective like "biological imperatives", is superficial, does a disservice to both sides of the debate, and can lead to surprising, perhaps even repugnant conclusions. This reductio ad absurdum is offered in direct opposition to circletimessquare's approach, to which I was directly responding.)