It's not once every 20 years. I was pointing out that it happened 20 years ago to another American protestor and nothing changed. My friend's husband, a white American, is in Ramallah now and he was filming a video for Instagram when suddenly Israeli soldiers started shooting at them and he and his group were informing them that they were American (and of course, the soldiers didn't care).
As for Palestinians, incidents like this happen all the time. Like I said before, over 200 Palestinians were killed (including a few that were American citizens) pre-Oct 7th last year from incidents like this, but it was mostly ignored by western media or was a foot note in the news. Now, imagine if it was Hamas that killed 200 Israelis and some of them were American. Do you think it would be ignored?