Only to a certain extent, given the amount of people that think it's out of order to even be against Ashley in the first place.
I think it's a total grey area in the sense that as a campaign it's difficult to promote and hope that people fall in line and do it constructively, given the amount of nutjobs and idiots on twitter. But if you promote doing it sensibly, it's not so bad.
Then again leaving it without promoting leaves the people who wish to, free to do it and distances the campaign from any unwanted scrutiny those tactics might attract. The only issue then is that it's more likely inviting a higher % of people tweeting his clients in the complete wrong way.