It does appear to me those "trials and tribulations" that we believers deal with today will not be the tribulation as described during those seven years. Tribulations the world has never seen before and will never see again. Two different animals. Why would our Heavenly Father cause us to suffer such? The seven years tribulations are for those who rebel.
Here is an ugly truth that is sometimes forgotten...God doesn't cause the suffering, man does. And that includes judgment.
The condition of the world is not God's fault, but man's. The persecution men go through finds other men culpable, not God. While the judgment seen in the Tribulation can be seen to come from God, it is man that brought that judgment upon himself.
A parallel question might be "Why did God allow children to die in the Flood?" To most this might seem harsh and unfair, but, the judgment that fell was due to...man. It is just my view that the children that died in the Flood were bestowed mercy, in that if they had grown up they would no doubt followed in the footsteps of their fathers.
So the real question is, "Why do men cause us to suffer?" And we know the answer, particularly when it comes to the judgment that falls in the Tribulation:
2 Thessalonians 1:8-9
King James Version (KJV)
8 In flaming fire taking vengeance on them that know not God, and that obey not the gospel of our Lord Jesus Christ:
9 Who shall be punished with everlasting destruction from the presence of the Lord, and from the glory of his power;
God's judgment is always just, and it is because of man's sin, which is the reason God has always judged man, that His children suffer. But, oftentimes it is also the sin of His children that causes the suffering.
The seven years tribulations are for those who rebel.
Not just for them. During the Tribulation there will be those who come to saving faith, and some, perhaps many will die. Many will face persecution at the hands of Antichrist.
Revelation 6:11
King James Version (KJV)
11 And white robes were given unto every one of them; and it was said unto them, that they should rest yet for a little season, until their fellowservants also and their brethren, that should be killed as they were, should be fulfilled.
Revelation 7:13-14
King James Version (KJV)
13 And one of the elders answered, saying unto me, What are these which are arrayed in white robes? and whence came they?
14 And I said unto him, Sir, thou knowest. And he said to me, These are they which came out of great tribulation, and have washed their robes, and made them white in the blood of the Lamb.
God bless.