Who's being convicted? The guy's dead. Also, his sexual assault of minors is
pretty well established as fact. The impetus for the name change wasn't some random politician, it was a submission to the Royal Commission into Institutional Responses to Child Sexual Abuse. And it wasn't some nameless nobody politician who announced the decision, it was Mick Gentleman, who is a veteran MLA and quite well-regarded in the community.
Actually there is a fairly substantial cost to changing the name of a major road as all signage, maps and related records need to be updated.
ETA but that's obvious so I'm not sure why I mentioned it. Maybe I'm in a bit of a **** mood tonight as well.