I try not to engage in ad hominem, but jesus christ I want to here.
Yes I read the last line. Being logged in but posting with an anon tag is not the same. There is still a record on the site that can be sold or subpoenaed. Yes, I know that not having a login still leaves IP records, but people who want to be anonymous can mitigate that with VPNs, TOR etc.
Also, with a required login, trolls and spammers will still use shill accounts.
If you want to see a shining example of required login commenting, go look at youtube comments on some popular videos. Especially ones that are political or religious in nature. Or go look at a local news stations disqus comments.
This community website HAS taken steps to deter trolling and spam. It is the moderation system and may need adjustments. It is not perfect, but it works while allowing real anonymous speech that is worthwhile to shine through. If you do not like the spam, do not browse at -1. Unless I am moderating, I browse at 2, and see very little junk.
If you think stifling speech to fail at blocking spam is a good idea, your thought process is not much different from those who would have backdoors in encryption to fail at stopping terrorism. It is a trade of liberty for false security, and in the end you WILL lose both.