No one was hurt, at all, other than by their choice to be hurt. Do you disagree with this? If so, I'm curious how someone was hurt. I am genuinely curious why you would disagree with this.
Someone had to clean this up, right? If so, someone was hurt, maybe not physically, but they were hurt. Whether that be the guy that put the logo on the field or the guy paying him to clean it up... Yes, people shouldn't let it get to them... and I'll echo ben as well. People shouln't be engaging in activities that they know will incite others. It's called maturity, and it needs to happen on both sides.
Personally, I think it's childish. I don't think sending a 95 MPH baseball at the guy's head is the answer (perhaps a bruise on the thigh), but if I was in charge of the situation, I'd make Harper do what I'd make my kids do: fix it, and to the standard it was before he messed it up. If that meant he didn't make it to the club that night, oh well. If he missed his flight, oh well. He'd have to get his own ticket and deal with the consequences. If someone wants to act as a child, then treat them as one.