1. Shen Wei is Shen Lanzhou's grandfather. Shen Lanzhou's feelings for Shen Wei may have given him a firm belief in his loyalty to Shen Wei. Although Shen Wei was arrested, there is no substantial evidence to prove that he collaborated with the enemy.
2. As the grandson of Shen Wei, Shen Lanzhou's position may be influenced by family factors. Out of family honor and respect for his grandfather, Shen Lanzhou may resolutely defend Shen Wei's reputation and insist that he has not collaborated with the enemy.
Shen Wei was arrested because of political struggle, not because he really collaborated with the enemy. In this case, Shen Lanzhou may think that his grandfather is innocent, because he thinks that Shen Wei's behavior did not endanger national security, but was only a victim of a political struggle.
Generally speaking, Shen Lanzhou firmly believes that Shen Wei's failure to cooperate with the enemy may be based on personal feelings, family honor, insight into political struggle and other factors.