Besides which, the Seattle Times gets it wrong in their title line: It’s common sense for Seattle to tax gun sales to study violence
The money isn't going to "study violence". It's going into "'gun violence' prevention programs". There's a subtle difference.
It's been known for years that "'gun violence' prevention programs" are a euphemism for "gun control" programs and groups. The "tax" basically forces lawful gun owners to fund the demise of their own rights.