The reasons for each fan's frenzy may be a variety of things, but they are no more than a few:
First, the characteristics of soccer itself. On the soccer field, the game, the confrontation is intense, technical and tactical complexity, the players run at high speed with amazing individual intelligence skills and teamwork tacit understanding, the players become artists, making soccer an art field for fans to enjoy themselves.
The second is the popularity and accessibility of soccer. Soccer doesn't need to be too high for people like basketballs and footballs. In countries like Europe, soccer offers the dream of soccer stardom to those who are poor and hardworking, and is an inspiring motivation in everyone's life.
Third is the ever-changing soccer field. Soccer games are long and require players to be on offense and defense at all times. The spectators in the audience are watching the ups and downs. Just in the wee hours of the morning, Portugal, Spain. Portugal experienced a lead, equalized, reversed and then balanced the game with a hat-trick from Cristiano Ronaldo, a flip of the story that really ignited the audience; Uruguay didn't score for the first time until the last 90 minutes, also a crucial goal. Stadiums have always been places where miracles are made, and at the last second, they will happen. In this case, adrenaline is secreted rapidly, making for a bloody good time. The fourth is the great motivation and posture of the fans. Fans from all over the world have flags which are painted to represent the colors of the flag. A variety of loud voices calling out athletes to cheer and so on add another feature to the landscape of a soccer stadium.
It is so hard for the bottom two teams in the league to beat the first team. It's too hard for a team between two levels, and it's too hard for a lower level to beat a higher level team ...... It's too hard. There's basically no way to win and lose by as much as you can, except for off the field factors. But soccer has that possibility. Seeing too many underdogs and overdogs, many lower level and even ranked teams, meet a strong team that can grab a goal and hang on, and maybe it's really cold! Maybe you try your best to make it zero to zero. Maybe you can't win a thirty foot shot. (See this year's Champions League as Manchester United knock out Paris.) This uncertainty is like life, there is no such thing as eternal victory or eternal defeat. Do you want to win? Well, then you should fight first. The harder you work, the more likely you are to win. To borrow a phrase from Mr. Zhan Jun: It's soccer! Why don't you love soccer?