We publish deadnames because nearly every single troon is running from something embarrassing they did before they trooned out, and it's just more shit to point and laugh at. It's not just deadnames, it's every alias a cow uses, which is why most every thread title has multiple names listed, like Lucas's five names and aliases above. It's used to help link all the dumb shit a cow does together and aid in finding more.
If someone wants to use that info to go "lol how's it going lucas," that's on them. But honestly, if all it takes to fuck with you is to call you by your birth name, you might want to ponder how fragile this troon facade truly is and whether it's actually making you happy.