"Never attribute to malice that which is adequately explained by stupidity" - This sums up my thoughts.
I think a shitty rocket flamed out and dropped like a brick in the carpark. This is supported by footage from Al Jazeera (Qatar mouthpiece, they support Hamas), as well as what the aftermath looks like from various sources. I think the Israelis initially assumed it must've been them somehow because what else could it be, so the propaganda shills got on Twitter real quick to make it sound better. They then deleted it once it started looking like they weren't responsible and that was a retarded thing to do.
It's a chain of stupidity and Hamas is just pushing it through because that works for them. The diplomat in this interview I think embodies it perfectly: https://www.youtube.com/watch?v=GvDAra1VFnE