As an example, it would be wrong for me to go onto your college campus and tell people to repent of their sins and turn to Jesus Christ for forgiveness?
That would depend upon the manner in which you presented the gospel. If your going around yelling at people that they are going to hell - then yes it would be wrong.
And then if they just mocked me, it would be especially bad for me to tell them that judgment day is going to be REALLY bad for them? Is that a good example of the wrong model you are referring to? (You seem to have experienced campus preachers).
Yes, that would be really bad. It's not effective in the least and only makes a mockery of Christianity.
So, since this is exactly what Jesus did, maybe we should give Jesus a heads up that he was making a mockery of Christianity.
Jesus went from town to town telling people to repent of their sins and turn to God.
From that time Jesus began to preach, saying, "Repent, for the kingdom of heaven is at hand." (Mat 4:17)
When they didn't, he denounced them (is that the same as "social outcasting") and told them that judgment days was going to be REALLY bad for them.
Then he began to denounce the cities where most of his mighty works had been done, because they did not repent. "Woe to you, Chorazin! Woe to you, Bethsaida! For if the mighty works done in you had been done in Tyre and Sidon, they would have repented long ago in sackcloth and ashes. But I tell you, it will be more bearable on the day of judgment for Tyre and Sidon than for you. And you, Capernaum, will you be exalted to heaven? You will be brought down to Hades. For if the mighty works done in you had been done in Sodom, it would have remained until this day. But I tell you that it will be more tolerable on the day of judgment for the land of Sodom than for you." (Mat 11:20-24)