It's normal. Most large earthquakes have hundreds or even thousands of aftershocks, though most are too small to feel. Sometimes a single earthquake can have multiple main shocks too. Also aftershocks aren't really earthquakes, they're just everything that got displaced adjusting to its new position. depending on how much stuff was moved and displaced, they could be pretty destructive.

First reason is that mucosal tissue creates a physical barrier that is very hard for microbes to get through. Additionally, the vast majority of lymphocytes in your body are found in those tissues. And your immune system is just in general much more active there too. When cells detect an invading organism they don't call for help, they just initiate the immune response themselves.

Of course, it would be horrible for our entire bodies to be composed of this sort of tissue. its great against microbes, but not so great about mechanical damage. So you only find it where its most important.

Well the first step would be calling the police.

Dirt roads don't really get potholes. Instead, this happens: https://en.wikipedia.org/wiki/Washboarding Its incredibly annoying. You have to get like a bulldozer to level it out every now and then. Your analogy still works though :D