I encourage you to understand this issue more deeply. But if it is evidence you lack, here it is:
A timeline of TikTok's history of reported security flaws, continual failures to fix them, and why it is currently in this situation: https://apnews.com/article/tiktok-timeline-ban-biden-india-d...
A list of countries that have already banned TikTok and their reasons for doing so: https://www.pbs.org/newshour/world/these-countries-have-alre...
Of course, that list does not include China itself, which also has TikTok banned locally.