Yeah, except there are no arrests happening in the US based solely on someone being an anti-Trump protester, and Facebook doesn't directly share the user data with anyone.
Inb4 Cambridge Analytica, FB didn't just hand off the data to them, users had to use a special third-party app within FB and explicitly give it permission to access the user data. And those APIs aren't available anymore after the backlash either way.
Especially useful for capturing younger users who are more likely to be anti-Putin.