I find that hard to believe…
absolutely 100% true for some people. Telling some people how much Hashem loves them just fosters the feeling that Hashem knows they mean well and accepts them for who they are, not always motivating change. For some people, knowing that the fires of gihenom await them for specific actions is enough to jolt them out of participating or going deeper into it, and refraining from the behaviors brings more clarity, thereby encouraging the person to stay away long term and grow further.
I’ve heard about it from speakers, seen it in others and experienced it myself. And if you read Dr. Twerski’s experiences with drug and alcohol addicts, he tells you that they have to hit rock bottom. They have to actually see the gihenom they have brought on themselves and their families because until you understand the severity of the consequence, you don’t have a strong enough opposing force to the pull of the addiction.
Joseph yelling at people is worthless, but legitamte Torah sources and Rabbanim teaching the firey consequences to certain behaviors and lifestyles is life changing. If not for you, then that’s you. Many people out there are not you.