Had he not used Tor, he would never have sent an email: he wouldn't have felt secure.
"Trying to use Tor to protect you against interrogators who are convinced of your guilt and willing to torture you to death is like trying to toast your bread with a hammer."
It's Tor [traffic analysis] that led integrators to him in the first place.
Also, Tor is frequently advertised for use against repressive governments.
That is unknowable, certainly not certain. Plenty of people called in bomb threats before Tor was invented. Hell, he may have just pulled the fire alarm instead.
> "It's Tor [traffic analysis] that led integrators to him in the first place."
Tor is not safe from traffic analysis; it is pretty trivial to figure out if someone is using Tor. This is a well known limitation of Tor that must be understood by anybody using it, particularly if they are living under a repressive government.
If you are using Tor with the expectation that nobody will be able to tell that you are using Tor, then you are trying to hammer bread into toast. That is simply not what the tool is for.
It is certainly possible that the Tor project needs to work harder at making sure people understand this.
Nobody but a fool thinks that Tor (or any other piece of technology) is a silver bullet. It is just a tool, and like any tool, has intended uses and numerous shortcomings when you use it without knowing what it is for.
Trying to use Tor to protect you against interrogators who are convinced of your guilt and willing to torture you to death is like trying to toast your bread with a hammer. Completely nonsensical, though that does not mean a hammer is a bizarrely useless contraption invented and touted by fools. Asking what the point of Tor is if it cannot protect you from that is like asking what the point of body armor is if stepping on a landmine still blows your leg off.