If I was a murderer I'd go out with a steak.
If I was innocent and the justice system were taking my life, I'd go out with the hope that there was more justice in an afterlife than I had found in this one.
Now I happen to personally think the holy communion is as holy as a happy meal. It's what we conjure up to make it. It's as important as we convince ourself it is. But that doesn't mean I don't see this as a way of dealing with the unthinkably awful task of coping with the reality that your innocent life is going to be taken away from you by people who think you did something you know you didn't do.
Edited:
And further. You know who takes communion? People who are saying they are right with God. I was taught when taking communion that if you aren't right with your brother and God than you can't take communion. And I saw that manifested by people in the church refusing communion from time to time. Women who were cheating, dudes you knew were going through divorces, that sort of thing. Basically, if somebody knew that everyone knew about something they were doing, then they'd follow the rule of refusing communion. In reality everyone should've been refusing the communion, but I digress. A conversation for another time. It's really a statement to those around watching.
If I'm innocent and I've declared my innocents throughout, and it's my last meal and I believe in it and everything, I'm showing "I'm communion ready". I mean it's silly but when it's a last thing for your innocents to stand on, it's something.
Just my perspective from my small slice of the bible belt.