Tox, in the Mafia, failed to secure a kill on the block, but managed to avoid being killed himself. It's both funny and harsh.
Basically, I agree with Revanka and Spir on this.
To add to that: there are certain nuances that, in theory, could have prevented the kill, but I think the block played its part.
I like the idea that the Mafia is OBLIGATED to kill, and therefore we execute players who are blocked.
There are some specific character traits, but I'll try to describe them later.
Right now, I agree to execute Tox because he was blocked by a Town member.