About 17% overall. There's stark differences between age groups, but none have a majority. Even if the poll is off by 10 points (which would be an egregiously large polling error), only a small but vocal minority are in support.
The actual Emerson college survey has it at 58.7% of the people find the shooters actions as completely unacceptable. True 16.5% find it completely or somewhat acceptable. Lots of neutral and unsure at 15.9% and somewhat unacceptable at 9%.
BTW this poll isn't perfectly accurate in who they sampled as 37% south,17.7% northeast , 52% women, 18% post doc, 24% college grad,also so many old people versus young. The demographics aren't properly proportional.
That being said best insights we have polling though may be a way of the past
Personally I think it does as the institutional and mainstream answer is completely unacceptable. To have so many waver or not want to answer is pretty telling/meaningful. IMO