They wild opinions are why this list is not a "consensus" of any sort. If someone has a certain opinion they are labeled as criminals, spammers, etc. without any legitimate reason. This type of stuff comes from a religious belief and not anything that can be explained by logic. I don't see why there is all this discussion of mandatory abuse fields when the RIR whois databases are filled with inaccuracies and false whois data. When I point these out to ARIN I never hear back and it never gets fixed and I assume RIPE is the same way. Until you take care of that problem it is useless to require mandatory fields of any sort.
So, my personal summary is: --- Anybody, who is against a mandatory abuse field, is a professional spammer, abuser, maintains a bot net or sells open proxies or other services used for abusing others. They are criminals to my opinion.
But thats only my impression ... ---