1. The guy was going to Palestine not to Isreal. 2. Because Palestinian is de-facto ghettoised he had to travel through Israel to get there 3. He was organising a piece of fun for Palestinian kids. 4. He was perhaps going to give them some hope. Maybe this was his real crime.
Islamic State militants blow up ancient Arch of Triumph in Palmyra (Reuters)
from the article: Shin Bet deports Spain's most famous clown upon arrival in Israel