The Spirit World and This Human World over the Dead
It is because human bodies and souls (with his minds) were created through spiritual energy like everything in the material world was. Dead human bodies just turned to another form of materials but human souls returned to the spirit world where they had been originally generated. A man's soul is separated from his body that is essentially material when he dies. The mechanism of materials going back to the spirit world is different from souls going back to the spirit world as a spirit.
So, sadness felt by others seeing their friend being dead is not absolute, although from the human point of view such sadness is acute. Even the Lord Jesus Christ tried to bring his fried back to life, although He knew that His friend could continue to live as a spirit in the spirit world.
https://etc.usf.edu/clipart/189200/189248/189248-jesus-resurrects-lazarus-of-bethany.htm
But it does not mean that life in this world is essentially meaningless. The life in this world with the body and the soul has its specific value not possessed by the soul as a spirit in the spirit world. So, sadness to see one's family member or friend being dead in this world should not be made light of. The dead man consisting of his body and soul is no more in this world but his soul continues to live as a spirit in the spirit world. Yet, it is natural and meaningful for others to feel sadness seeing their family member or friend being dead.
But it does not mean that life in this world is essentially meaningless. The life in this world with the body and the soul has its specific value not possessed by the soul as a spirit in the spirit world. So, sadness to see one's family member or friend being dead in this world should not be made light of. The dead man consisting of his body and soul is no more in this world but his soul continues to live as a spirit in the spirit world. Yet, it is natural and meaningful for others to feel sadness seeing their family member or friend being dead.
If the spirit world is complete, the God must not have created the material world and sent human spirit to the material world or into the human body in this world.
However, living men often regard this material world as the only sure world, while neglecting the spirit world. Even science in this world cannot be effective in dealing with the spirit world. It is absurd to claim that what deficient science cannot prove should not truly exist.
The spirit world is superior and this material world including the human world is subordinate. However, the spirit world itself is not complete and perfect for some aim related to the human beings, so that the God created the material world through spiritual energy and put human spirits as souls into the human bodies.
Related to the aim, we have to grieve to see our family member or friend being dead like the Lord Jesus Christ.
Nonetheless, the God must not feel sad to see anyone being dead in the human world. In addition, Satan must not either. Yet, a true religious man like the Lord Jesus Christ who understands the spirit world should also feel sad to see anyone being dead in the human world.
Therefore politicians who cause a war such as one in Ukraine or Gaza should be close to Satan if they are not close to the God.
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Mark 5, King James Version
5 And always, night and day, he was in the mountains, and in the tombs, crying, and cutting himself with stones.
6 But when he saw Jesus afar off, he ran and worshipped him,
7 And cried with a loud voice, and said, What have I to do with thee, Jesus, thou Son of the most high God? I adjure thee by God, that thou torment me not.
8 For he said unto him, Come out of the man, thou unclean spirit.
9 And he asked him, What is thy name? And he answered, saying, My name is Legion: for we are many.
10 And he besought him much that he would not send them away out of the country.
11 Now there was there nigh unto the mountains a great herd of swine feeding.
12 And all the devils besought him, saying, Send us into the swine, that we may enter into them.
13 And forthwith Jesus gave them leave. And the unclean spirits went out, and entered into the swine: and the herd ran violently down a steep place into the sea, (they were about two thousand;) and were choked in the sea.