For the obligatory car analogy. Are you or are you anonymous in a vehicle. They most certainly have the name of the registered owner and access to that is restricted to the police and applicable government authorities. However the name and via search extension address and telephone number of the driver and passengers is not readily accessible.
How many jock strap douche bags offended by a post would visit the home of the commenter and attempt to beat the crap out of any one there. How many drunks would over react with access to name, address and contact details. How many child would came under threat with the name and address published. How many employers would over react at employees posting especially if employees were telling the truth about employers products.
The relationship of employers and employees isn't that always in reality the reason will right wing control freaks seek to end anonymity online, the ability of employers to control the postings of employees and their families online, not only censoring them but forcing them to make positive comments about the employers products.