It could be because soccer is a very international sport. It could also be because soccer is easy to play and does not require very much equipment, unlike other sports such as hockey or Basketball.
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Why should they not? Everyone has different things that they enjoy! If everybody liked and cared about the same things, this world would be a very boring place to live. Soccer can be a very enjoyable sport to some and maybe not to others. It is a game - therefore it is fun. It is a good way to exercise, it is a way to spend time with others, and it is something that someone CAN care about. There are many reasons why people should care about soccer!
In the final analysis sport doesn't matter very much but if you don't care it's no fun. The Liverpool manager Bill Shankley once said, "Football is not a matter of life or death. It's more important than that." You can argue he was wrong but its being passionate and caring about the game that makes it interesting.