I will have to retrieve the article which does happen to address this particular concern.
When a logic and critical thinking classmate objected to my use of sarcasm as serious scholarship, my professor defended it as a legitimate, and effective, form of expression.
Sarcasm is a powerful tool. As a weapon it can cause a lot of damage.
The validity of its use depends, as with anything that can be used as a weapon, on where it is being aimed, and with what intent.
It is most commonly known for being used for evil, and it is very easy to use it that way. It takes a lot more care and precision to use it for good.
The ease of use for evil makes it all the more troubling that it can cause so much damage. Almost anybody can use it to hurt somebody.