

Because it’s the bully stick he gets to hit other countries with to get his way … or just to retaliate against those who offend him.
Also because the on-again off-again arbitrary and unpredictable tariffs are a great opportunity for insider trading for those in his inner circle who are given advanced notice of his capricious changes.
Also because doing random bullshit with tariffs occupies the news cycle and helps distract from a lot of the other bullshit he’s doing or has done in the past.


That said, imagine an actual AGI (ASI) AI gets developed and (of course) escapes to the internet because the idiots who built it gave it unrestricted internet access.
If such an AI wanted to take control of the world in order to further whatever goals it has, all this collected information will be an incredible treasure trove for it. Like you said, many people can be manipulated an controlled with threats of blackmail. The few who can’t can then be more directly threatened by those acting under blackmail threats.