To see a spiritual side of Thai culture you have to get up early and head to the streets where the monks are out for their daily alps. You will see normal men and women offerings to the monks for the karma merits. Why would do they such a thing? It was in the Buddha teachings. You have to ask the monks for those teachings
They are the keeper of the Buddha teachings. If you have a chance to hear one of the Dharma talks then I suggest you go and listen to it. And maybe during the Q&A you might want to raise the question to them.