Kim’s first consideration in any situation is his personal safety. He fears assassination more than any other public figure does. Paranoia in Norkea is a survival tactic. he fears sitting on a toilet with an explosive charge in it. He brings his own food for fear of poison and in his world, fearing that Trump would have him poisoned is not irrational. He would do it to someone else so why would not Trump do it to him? Were the meeting to be in Pyongyang then likely Trump would take some extraordinary precautions, himself.
Beware the Tidy Bowl Man