I think there can be no doubt that JFK would have jumped ship during the 70's or 80's like *SO* many RATS of his generation did during those years.My parents having been just two of them.
Kennedy would not have jumped ship. He only cut taxes to increase revenue for his proposed welfare state increases, which were later implemented by LBJ who ALSO cut taxes. Cutting taxes does not necessarily translate into oppostion to expanded government. In fact, he can be used a certain times for the opposite goal.