The Japanese cops can be a bit scary when you are staring them in the eye and worrying about whether they will seize your bike or toss you in jail, but when it comes to safety pics, they take the edge off a bit by replacing the "polite but suspicious officer" with a cute teddy bear!
Incidentally, making things look cute is an important skill in japan.
Take the following situations...
1) your teeth are possessed.
2) Lightning bolts shoot from the ceiling and light your brother on fire while he's playing his guitar.
3) A really creepy guy contemplates waiting until the girls move past massage before joining in.