The places presumably don't have power or fuels to spark fire since they've been closed so longer. Also, it's very wet around here, so it's not a brush or forest fire issue. Finally, it's not just Jewish hotels and camps; there was also the Ukrainian one: https://hudsonvalleypost.com/suspicious-fire-at-ukraine-camp-in-hudson-valley-ulster-county-wawarsing-ellenville-new-york/