Connectedness also stops us from waging war. Or, I should say, it does not stop us, it makes us less likely to start one. But we still do it evidently. And then we all suffer.
Do we? If you read something like guns germs and steel or read some Harari, we may not have had big wars with big guns like today, but we sure had a lot of smaller conflicts.
Yeah we do. Most since like WWII. Obviously depends on how you define a "war", so it can skew one way or another.