It all matters on the type. Some are fine to keep as pets while others aren't. It also matters on what it eats, living conditions, and if you can take care of it.
If you can't meet those conditions then a sea urchin isn't a good pet for you, and it may for others. If you can do those 3 things then also research on the type you want before you buy it. GOOD LUCK!
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.