The verses don't make sense to me.
Typically, when a fundamentalist makes a pronouncement followed by a scripture reference, the reference is supposed to support the pronouncement. "Do XYZ!!! (I Opinions 5:34)". The assumption is that anyone who uses scripture as an authority is compelled to agree and obey with the preceding pronouncement, thus giving it weight. Thus the speaker is saying, "Scripture is Truth. I repeat Scripture. Therefore, what I say is Truth."
In this case, the pronouncement is "Jesus is Coming Soon! Stop Killing & Shooting Stop Lying". First off, the two ideas don't really go together. Why should we stop killing, shooting, and lying just because Jesus is coming soon (whatever that means)? If Jesus
wasn't coming soon--say, if this sign was being read at anytime during the past 2,000 years--would killing, shooting, and lying be acceptable? "You've got centuries before Jesus will come, so feel free to shoot, kill, and lie. You've got time."
Second, assuming the Bible verses are being used to authoritize and support the pronouncement, they're failing at that. Let's look at each in turn:
Matthew 11:28 “Come to me, all you who are weary and burdened, and I will give you rest."
This is a promise from Jesus. We're to go to him--there's nothing here about Jesus coming to us. And suppose I'm weary and burdened from all the killing, shooting, and lying--will Jesus ease my burdens from living a hard life of violence and deception?
2 Corinthians 5:17 "Therefore, if anyone is in Christ, the new creation has come:The old has gone, the new is here!"
Again, nothing here about Jesus coming soon. Paul argues that if you're a Christian, then Jesus is already come--present tense.
The Psalms reference are even odder:
...whose tongue utters no slander, who does no wrong to a neighbor, and casts no slur on others...who lends money to the poor without interest, who does not accept a bribe against the innocent. Whoever does these things will never be shaken.
Err, context please. What are we talking about? The passage starts in the middle of a sentence and skips an entire verse--a bit suspicious, that. Nothing here about killing, shooting, or lying either. Uttering slander could be a kind of lying, I suppose. These two verses are snippets of a longer list that the psalm-writer is compiling to identify who's allowed to "dwell in the Lord's sacred tent." Assuming that's a good thing--I prefer my dwellings to be climate controlled with running water--but again, context is key. But even more so, there's nothing here about why I should pay attention to the message that "Jesus is coming soon."
It's a head scratcher, that's for sure.