I essentially agree with the validity of their arguments, but I have counterarguments that are, in my opinion, stronger. Basically, they are right about the concerns they are voicing, but I think that overall we are still looking at subversive acts done primarily - almost exclusively, in fact - by a demographic that is also largely powerless and voiceless; a demographic who, if their husbands left them, would fare very poorly. They have privilege, but it is largely a privilege conferred upon them by the status of their husbands. So I embrace yarnbombing with all of these issues in mind, including those which cause some people to reject it.
A tiny, petty act of rebellion is still rebellion.