The following applies to Revision 3 of the linked answer, the one that was current at the time of this post.
The answer uses the fuzzy term "right". Sometimes when people say something is "your right" they're speaking morally or about "human rights" -- the US declaration of independence, for example, asserts rights that were clearly not legal rights at the time, hence the ensuing war. Other times when people say "right" they mean "legal right".
Assertions of moral rights can be problematic because they're opinions and we're looking for answers that are more than just opinions of random people on the Internet. Assertions of legal rights can be problematic because they imply authority that isn't present. We are not the only SE site where following bad advice can be dangerous, though, so "delete wrong answers" isn't automatically the preferred response, either.
I don't see this answer as dispensing legal advice. It could be made even more clear by changing "It is the right of every person..." to "It is the moral right of every person..." or something like that. It's ok to edit other people's posts so long as you don't change the meaning; why not try it?
If the answer instead said something like "Under US law it is the right...", then it would be quite reasonable to ask in a comment for a citation. If it got flagged the mods would most likely drop a "citation needed" annotation on it in the meantime. You complained about comments being deleted, but it hasn't been wholesale. We've deleted an awful lot of back-and-forth argument, but a comment asking for a source (or for any other clarification in a post) isn't something we intentionally delete (until it becomes obsolete, anyway). But don't start an argument in the comments; instead of "you're wrong because of X, Y, Z" one can say "how do you account for X, Y, and Z?". You can challenge without starting a discussion thread.
(All "you"s in the previous paragraph are generic; I'm not talking specifically about the OP here.)
We've talked before about the subjective nature of answers here. We don't require sources if an answer can be supported by (stated) experience or by reasoning. This answer demonstrates reasoning, in my opinion -- it may or may not be reasoning either of us agrees with, but it's not a non-answer and to my eye it's not even a legal claim, let alone a dangerous one.
On all SE sites, following some answers could be dangerous and it is up to the reader to do due diligence. The best answers will provide readers with the means to check them. But not every answer does, and people should vote based on their perception of a post's value.