It's because the verb 'have' describes a state here, not an action.

因为动词 have 在这里描述的是一种状态，而不是一个动作。

The fan later explained his actions, stating that he is a huge fan of Messi and wanted to take a picture with him and get his autograph.

这名球迷随后解释了自己的行为，称自己是梅西的超级粉丝，想和他合影并得到他的签名。