Why is there a sign on the back of most cars: "Bear Watch out"? What does this mean?

The original intention of "Attention to Bears" is this: There are two kinds of symbolic animals in Hokkaido, one is an owl, and the other is a bear. You can always see these two in the shops of tourist spots and resorts everywhere. In the past, there were probably enough bears in Hokkaido, so people posted warning signs of "Bear infestation" in places where bears frequented. Now, this warning slogan has become a trademark, with black characters on a yellow background, and it has become a feature of Hokkaido on many commodities such as T-shirts and wine glasses.

It was meaningless, so isn't it meaningful to appeal to the majority of car owners not to label Japan, tear off the "bear infestation" and replace it with "great wall never pour"?