I could continue with examples for pages, but in the end a world without lies would still harbor bad people and allow their deeds. People would not be more honorable if lying did not exist. They would just be more honest in their assaults. All of the evils, events, calamities, and personalities that were brought to our world by lies would still find a way of surfacing in a society that speaks only truth. Then there are those white lies that we consider to be harmless.
All lies cause harm, even if that harm is displaced slightly by good intentions.
Probably not, even if a white lie makes you feel better. Also, the truth can be finessed without removing it from the equation. We might have a little trouble convincing a loved one that her hair looks dandy in a beehive, or his piano playing was nice, but we would find a way. At least, though, we would be honest in our attempts, instead of avoiding hurt feelings with a deception. Tongue-biting would be an art form in a world without lies.