Final answer:
Some students may be affected by the video shown in class due to personal experiences and emotional sensitivity.
Step-by-step explanation:
The reason why some students are affected by the video shown in class while others are not might be due to individual differences in their personal experiences, beliefs, and perspectives. Some students may have been personally affected by similar situations depicted in the video, making it more emotionally impactful for them. Others may simply have a higher level of empathy and sensitivity towards the topics discussed in the video.