These people tend to be those with an abundance of time. It's not worth much to them.
They might say that there's better things to do with one's emotional and time resources than react to them or try to censor them.
It's effectively an subjective DoS, they can cause someone else to expend emotional/experience/effort resources disproportionate and larger than those they expended themselves.
Hmmm... There's better things to do with one's time.