I don't doubt the possibility that Israelis were behind this attack, but there's a good chance this really was done by Hamas/Hamas related groups. from this post to the sub just earlier today, a Hamas official mentioned potential attacks against the pier:
Al-Hayya also implicitly threatened that Hamas would attack Israeli or other forces who might be stationed around a floating pier the U.S. is scrambling to build along Gaza’s coastline to deliver aid by sea.
“We categorically reject any non-Palestinian presence in Gaza, whether at sea or on land, and we will deal with any military force present in these places, Israeli or otherwise … as an occupying power,” he said.
so it could be a case of Hamas cutting off their nose to spite their face. I'm gonna have to see this reported by non Israeli news sources before I believe it though.
I wish I could find more data on this subject going back to the early 20th century, all I could find was US defense spending. Info like this is a lot more useful with historical precedents to compare it to.
maybe to prevent being identified? If the UK is broadening its powers to silence protesters like this, even being photographed as part of a movement of quote unquote "violence, hatred or intolerance" could be enough to face fines, arrest, or other social consequences.