Jesus was taking to a specific group of people, the Pharisees.
The prophecy he quoted was about a certain city in Israel. Note that Jesus did not merely state that "you Pharisees are acting like this verse in Isaiah", but much more strongly, "Isaiah was prophesying about specifically you people".
He took a "smite" aimed at another group of people from another century and applied it directly to a fresh group of people without bothering to justify it.
No wonder his followers commonly have done the same ever since.
That's the cool thing about Biblical smites. They can apply to anyone you don't like. Disagreements need not be merely personal. You may enlist the saints and prophets and invoke their authority against your opponent.
@kellyjaysaid Fear and love may be good motivators but I'd have to say fear is the cheap means to go from A to Z. Fear might cause you to act to protect your life, while love could cause you to lay down your life. Both have merit, but I think love is by far the better of the two.
"Better" is strong word.
When my rival tribesmen is [I]en route[/¡] to plug my arse with a spear, "fear" is the appropriate motivator .
@kellyjaysaid If I come to you and attack you and your beliefs just to belittle without serious conversation, am I being an honest skeptic? I didn't become a Christian until I was 25 years old, before that I didn't attend church, I didn't even know or hang out with people who did. I can promise you I have been both about the Christian faith.
I don't know.
You tell me.
Is your belittlement rooted in honest soul-searching, or are you just trying to score a conversational point?