Harlan Drake shot dead two people and was arrested before he could shoot a third intended target, according to Associated Press reports. One of the dead was James Pouillon, an anti-abortion protester known in town as "the sign guy" for his practice of holding up a sign with a picture of a foetus on it. Drake shot Pouillon when he was standing outside a school holding his sign.
Drake later attempted suicide in prison, and it appears that the three men he targeted were people he held grudges against for reasons as yet unknown from media reports I've seen. There have been suggestions, by columnists and bloggers, that his motive for shooting Pouillon was because he didn't like the anti-abortionist's protesting activities, but that's yet to be confirmed [warning that link contains some pretty full-on pro-life language].
The ex-expat has written eloquently of the time and place for activities such as Pouillon's. And I sure find it distasteful that Pouillon was holding his sign up opposite a school. Disagreeing is fine, yelling is fine, shooting is not.