The third reason that animals should not be tested is that will scientists ever use human beings to experiment with cures for animal diseases, So why do it to animals if not to humans first? How can I make this sentence good without the question mark

Look at this poster from the click it or ticket mobilization media campaign. what is the purpose of this poster? to let people know that they will get caught if they don’t wear a seat belt to let people know that tickets are the worst consequence of not wearing a seat belt to let people know that not wearing a seat belt can cause death or injury to let people know that they need to find other ways to avoid following laws