Matt 24 does indeed warn the disciples against seeing wars, etc., as signs. They are not told to beware of wars but to beware of deceivers. Matt 24 does not say "huge wars", "large loss of life", "lots of nations", "long wars", "many earthquakes with large loss of life". Also, wars, earthquakes (no volcanoes?) and such have always existed. Wars and earthquakes are not portents of good tidings.
Later in the Matthew discourse they are again warned against listening to deceivers saying he has come in the secret place or in the desert, and later still parables are given that again say things will carry on as normal (unaware in Noah's time) and it will happen when no one expects (midnight, long after the day had ended at sunset).
The people who wrote Matt 24 had heard Paul say he was expectiing the Coming would take place in his own lifetime; the people who wrote Matthew (aafter Paul's death) tried to dampen the expectation (they were allied to Peter, not to Paul). And later the guy who wrote Revelation aimed it specifically to people of his own time, saying it was going to happen "soon". Even Jesus is supposed to have said it would happen within the time of his own generation.
At every age since then people have warned of an imminent divine intervention. The score - a Big Fat Zero.
Doug