Inquire into their beliefs, feelings, and thoughts about life in the cult and outside the cult. Be more inclined to calmly ask questions, rather then proffer opinions. Open their minds to their own memories. . Find out what they believe and why. Question their beliefs or try to get them to question them, but do so in a calm, respectful manner so as not to push them into a defensive corner.
Timing is critical.
Calmly express your point of view, but don't insist that they agree. Respect their right to disagree. Demonstrate one's love and concern, but do not make this contingent upon agreement or obedience, for doing this will rightly be perceived as a bribe. Instead, show love and concern even when disagreement is substantial. When possible, neutralize anger by analyzing its source, for anger begets anger.