Why is it so hard to score points? Because there are a lot of people coming after and trying to stop you, blocking you and trying to pull you down. Just like sometimes it is hard for us to accomplish what we want to, because there are blockages or troubles or things in our way or people trying to keep us from our goals. But, they keep on trying until the time is up, and they get multiples tries each turn, like we can.
Why is there a halftime? Because they need a little break to rest and refuel before continuing. Kind of like when we take naps, or quiet time at home.
Why do they wear helmets? To protect their heads, like your bike helmet. Remember, the head you have now is the only one you get so you have to treat it well, just like I tell your brother 32 times a week.
Why are their uniforms red? Because it's a great color.