Very bad, not just for the victims, but for public debate more broadly; I very much hope that it remains an aberration, or else the consequences will be bad for speakers with a vast range of views. From CNN:

Authorities have charged an Owosso, Michigan, man with two counts of first-degree premeditated murder in the Friday shooting deaths of an anti-abortion activist and another man, a prosecutor's office said.

Authorities say the suspect, Harlan James Drake, was offended by anti-abortion material that the activist had displayed across from [a local high] school all week.

Drake, 33, is accused of shooting anti-abortion activist Jim Pouillon, 63, and Michael Fuoss, 61, who were killed in separate locations Friday morning, the prosecutor's office in Shiawassee County said.

Authorities also have charged Drake with a felony firearm count and carrying a dangerous weapon with unlawful intent, the prosecutor's office said.

Drake also is suspected of "attempting to locate a third victim without success," the office said....

I've labeled killings and threats against abortion providers as anti-abortion terrorism before (see here, here, and here). This likewise appears to be a domestic terrorist attack, though as I said I hope that it will remain a rare isolated incident. (I say "appears to be" simply in case the initial accounts prove incorrect, or in case the defendant turns out to be legally insane or some such.)