Why would you want to change the world for the better, when you believe that the answer to the problem is for things to get progressively WORSE...so that you can be "raptured"...once God finally gives up on His "Project Earth Failure"?
Bad Eschatology has done far more collective harm to our youth than guns, and is no doubt a contributing factor to much despair, hopelessness, low self-esteem, low self-worth, depression, anger, violence, death, ministry burnout, and ministries aborted...due to many novices attempting to "fulfill their call" before the imminent rapture buzzer sounds.
People greatly err when they confuse THOSE last days (Of the old system...ending in 70 A.D.) with this NEW DAY... and the Old Age, before the cross, with the New Age that was ushered in at the cross.
We'd also do well to stop conflating ancient metaphors that were fulfilled in and prior to 70 A.D. with present and futuristic reasons for a hopeless Earth that needs to be destroyed.
Our Loving Father has great things for this generation, while much of the church has "Left (Jesus' Gospel of the Kingdom) Behind" in favor of the modern-day Christian fiction of Darby, Larkin, Scofield, Lindsey, Van Impe, LaHaye, Hagee, and friends.
Was your response to the recent school shootings, "Father, what do you want to do through me to help change this?" or was it "That's just a sign of the times. We don't have much longer."?
Thy Kingdom come, Thy Will be done, on EARTH as it is in heaven!
The last time that I checked, there were no shootings in heaven; and there won't be any in God's fully renewed earth.
When people in First Century culture heard the words "Preach the Gospel" (kēryssō euaggelion..."Evangelize"), they immediately associated that with HERALDING A REGIME CHANGE.
"Evangelical" is pretty much a 21st Century misnomer when there is no mention of King Jesus, the progressive coming of His Kingdom...and His will being done...on earth as it is in heaven.
Is the Kingdom past, present, or future?
The answer is "Yes" to all three.
Life after death, and Life after Life after death (resurrected, glorified bodies on a fully renewed Earth) are understood as God's free gift to mankind once we discover Life/Jesus before death and understand that victory over death is included in His "progressively coming" Kingdom!
The official New Age was ushered in at Calvary!
21st Century Evangelicals are focused on getting to heaven, while God is focused on bringing heaven to earth...through His New Creation!