Because we think something is right or wrong or because we like the consequences or don't like the consequences of something, does not make it right or wrong.  Our views are prejudiced by our beliefs, our culture, our personality, our interests and the powerful human ability to rationalize what we want into what is right.

Right and wrong exist separately from these things and must be inferred rationally from fundamental principles, not from what we feel.

For example, speaking up in defense of "truth."  If something is true then it seems anything we say or do to defend and spread the truth is right.  Hence we see pious fraud on these boards, no end of rationalizing the use of propaganda on these boards (of course if we are doing it in favor of the truth then it is not propaganda in our eyes but instead using powerful tools to try to overcome "irrational" views of others (it's seen as proper to use irrational methods to fight irrationality).

The thing is, we get a charge out of someone's being roasted on the stick of ridicule and mockery (and we compound the sin by calling it "irony.")  This pleasure to us justifies it and makes it right.  Of course this is absurd and indeed pushes evil.

The thing to remember is that our "truth" is not necessarily another's, and if we would find real truth we must use evidence and reason, not "irony" and other forms of unreasoned argument.  I don't know if roasting someone with irony ever works to change their mind -- I think it more likely to harden their view -- but even if it did succeed doing so would be unethical.