I have a reason too. Scripture.
If I were you, I would reexamine my "optimism." Scripture nowhere says things are going to get better and better and then Jesus comes. Rather it says men shall wax worse and worse.
The way you are coming off on this thread is that you think you have found this secret and are taking great delight in maligning anyone who doesn't agree with you, as if they have some emotional illness. Check your spirit, sir. Jesus might rebuke his opponents, but He didn't belittle them or mock them with the kind of spirit you are exhibiting.
I see your biases are showing.
"But evil men and seducers shall wax worse and worse, deceiving, and being deceived." (2 Tim. 3:13)
Note carefully that it does not say, as you apparently wish it to say, that mankind in general will "wax worse and worse." The word is spoken against a specific group of men, and, like Pharoah, they will continue in the hard-heartedness, growing worse and worse.
Thankfully the King has control over the hearts of men, and, by the power of His Holy Spirit, they are changed from hearts of stone to hearts of flesh. This is our delight in the poower of the gospel.
I'm optimistic because Christ is reigning over the nations, and His kingdom is advancing.
"All authority has been given to Me in heaven and on earth. Go therefore and make disciples of all the nations, baptizing them in the name of the Father and of the Son and of the Holy Spirit, teaching them to observe all things that I have commanded you; and lo, I am with you always, even to the end of the age." Amen." (Matt. 28)
When Christ claims all authority and commands His followers to make disciples of all the nations, there is an implied expectation of success. There is an expectation that things will get better and better as more nations come under the influence of the gospel. We have seen that in history. The pessimist will not see it becaused they are looking for immediate perfection. But, just like when salvation comes to an individual, subjective holiness (sanctification) is a process that follows on the declaration of objective holiness (justification) which ultimately will lead to total holiness (glorification).
Glorification in the world will come about when sin is once and for all time cast into the lake of fire with Satan and all the enemies of the gospel.
It's been too long since you read the OT passage most frequently quoted in the NT, Psalm 110. See in particular the reference in I Cor. 15 -- "For He must reign until He has placed all enemies under His feet." Hey, it's kinda neat to have a reigning Lord present and active in your life! It gives you something to do with your life, battles to fight, foes to subdue, a God to glorify through significant activity.
People have reasons for what they believe, people have reasons for reading corporate defeat into the Biblical account of God's covenantal faithfulness to His people. It's not my job to try to read minds and assign motives -- but I keep thinking of the dwarves in C. S. Lewis's The Last Battle. So cynical, so hateful, that they sat in the middle of paradise and saw only a dank, filthy stable. The ten faithless spies looked at Canaan and saw certain defeat. Caleb and Joshua saw opportunities to experience more miracles from God's hand.
They looked at the same data set, and came to opposite conclusions. This, I believe, says less about the data than it does about the lookers.
I believe, though, that the "majority report" of American fundamentalists is as wrong now as the evil report of the faithless spies was then. We are at the beginning of the story of Christianity, and have yet to see the breadth, depth, and wonders of God's plans for us. Yes, we have a ways to go. Yes, the enemies are still out there. But yes, thank God, that means we (and our children) still have something to do!
Those muslims, those statists, those Goliaths, are bread for us.
Share blessings, and be a blessing, beloved elect of God!