I left my wallet and phone next to the pizza (in a bag, they weren’t visible), if people were going to take the pizza it’s likely they’d take the actual valuable stuff first.
May also help to know the beach I was at was in the wealthiest sub in my city. Petty crime is pretty uncommon at any beach though. People leave valuables while they go swimming all the time.
Look on the positive side, if he comes back for a second term there’ll probably be death camps so you’ll be killed and won’t have to remember when he becomes president for life.