Men who consume porn are shit in bed, to put it mildly.
I have a lot of issues with pornography, men getting ED isn't one of them. Primarily, I take issue with its production being potentially exploitative and, in some cases, it serving as instructive for abuse.
So, unless there is a study that unambigously proves that there is no negative impact of regularly using such dolls on men’s ability to understand and honor consent, this is just another irresponsible act that risks women and children safety.
As above, I see these as less harmful because they aren't instructive, that is, what the user does is purely of their own making. Any artificial sexual aid can be potentially harmful to relationships, for both men and women:
www.mazewomenshealth.com/wp-content/uploads/2015/12/Dr-Bat-sheva-Marcus-Medical-Journal.pdf
I used this link because it lets you read the entire article without an academic registration, if you have one the pubmed page is:
www.ncbi.nlm.nih.gov/pubmed/21205230
Please don't misunderstand, I find the idea of someone using one very unpleasant but I don't identify them as being specifically or exceptionally harmful.
why do you think serial killers often start with cruelty to animals?
It's predictive but I'm not aware of any studies that demonstrated it being contributory. Could you please provide a citation?