Wisdom in practice

My day time job is with a Drug Helpline . This is an anonymous phone, chat and online Q/A service for drug and alcohol users and their relatives, friends, families and anyone with questions. This job gives a lot of opportunity to put wisdom and compassion into practice. In average, I am in contract with about 5000 people every year. All of them in need of help and support one way or the other. In my personal life, thinking and meditation on the three marks of Dukkha, Non-self and impermanence has helped tremendously. I soemtimes think that "if only the users of our service could think like that, it would be so much easier for them". Example: Very often relatives of drug users do the exact opposite of whar would be a good strategy, they yell, demand the person to stop and the next moment they give them money for "stuff in the apartment and food". Another classic is this "My partner is the cause of my sepair because he drinks/drugs". If compassion is the wish for others not to suffer, and I have a very firm conviction about what would be a good way for them to suffer less, how can I best convey this? I can't say "you should meditate on the three marks" and "your partner isn't causing your despair, you are". For one it would ruin the dialogue and also I'm supposed to support the users perspective. I cannot use personal experience because I am a so called "professional".