I doubt TikTok is responsible for the pro-Palestinian content. The algorithms just feed you similar content of whatever you’ve been watching. And the anti-Israel perspective of the younger generation has been around for some time. A close friend of mine mentioned to me 7-8 years ago how his leftist daughter was anti-Israel and she’s half Jewish.
No, TikTok is not responsible, but those who own it and want the US destroyed probably are.