Actually soccer is technically football, but why bother with baseball? Only the US and Japan are interested in them.
The World Cup is the world's largest and most significant sporting event. Even if they targeted a major US event like the World series, that only has limited interest to tthe rest of the world. American interest in cricket would be on a similar level to everyone else's interest in baseball. For the terrorist who wants maximum exposure, better to target an event that interests 80% of the world.
I think you are making my point. Better IMO, to attend football or baseball in the good old US of A.