Random mailing routes actually make it easier to track down the original sender.
Perhaps you missed an earlier message I sent to the list ("Anonymous Mail"). If the message proceeds randomly through the remailers, then every single site must somehow be told the final address. Therefore, instead of just one site knowing the final destination, every site must know the final destination.
if every single site knows the final address, so what? how is this going to help them track down the original sender?? anyone at the final destination who wants to track down the original sender would need to hop-scotch backwards through the numerous sites and try to track down the path the message took. this is of course, IF someone really wants to go to this much trouble and if they think they can talk a slew of administrators into helping them with the witchhunt. 1 out of 5 odds that a "special processing script" is executed on the message and it is forwarded through a remailer or two using encryption. just set up 20 different scripts that route the message in encrypted form through various/random/secret/obscure remailer-paths.