Neither LHO or Cruz Sr. or any of the others involved with handing out the “Hands off Cuba” flyers were actually pro-Castro. It was an early data-collection operation in order to identify people with communist tendencies.
In short - it was a technique to identify the enemy.
After you watch the video of Lee Oswald passing out FPCC handbills and read the testimony of the mop up crew sent to Mexico City, it looks like the CIA were very clearly preparing the stage for LHO.