I agree we all ought to use available punctuation marks correctly. That said, I am compelled to lodge a formal complaint against quoted text arbitrarily assimilating punctuation from its surrounding context.

Quoted text is a sacred verbatim reproduction of its original source. Good authors are very careful to insert [brackets] around words inserted to clarify or add context, and they never miss an oppurtunity (sic) to preserve the source's spelling or grammatical mistakes. And yet quoted text can just suck in a period, comma, or question mark from its quoted context, simply handing the quoting author the key to completely overturn the meaning of a sentence?! Nonsense! Whatever is between the quotes had better be an exact reproduction, save aforementioned exceptions and their explicit annotations. And dash that pathetic “bUt mUH aEstHeTIcS!” argument on the rocks!

“But it's ugly!”, says you.

“Your shallow subjective opinion of the visual appearance of so-called ugly punctuation sequences is irrelevant in the face of the immense opportunity for misbehavior this piffling preference provides perfidious publications.”, says I.