Every accusation from Trump is something he himself is doing or thing about doing.
It's not random.
It's not random.
There are exceptions -- birtherism comes to mind -- but that's what they are, exceptions. In general, though, accusations from Republicans reliably reflect things they are either already doing, planning to do, or wish they could get away with.
He can just have wanted to punish Iran or something without it being a full blown plan. Trump assassinated an Iranian general during his first term [1].