No, law abiding gun owners are being penalized because of the negligence of
others. The fact that there is a gun involved is just an aside since stupid people do stupid things all of the time. So far this summer there have been reported over several dozen case of people forgetting their kids in their vehicles during high temperatures and those kids losing their lives as a result. The suggested "trick" to help them remember not to do this - put their cell phone in the back seat so that they'll be forced to look in the back seat before leaving their car.
They can remember to look for their phone but not to check that they haven't forgotten their kid?
As far as I am concerned, if a person doesn't inadvertently leave their weapon in a public place, they lock their doors & windows, arm any security system they may have, etc. the weapons
are secured however if someone makes it past all of that and breaks in, that's not negligence, that's being victimized by a criminal. This new Seattle law makes no distinction between the two and the U.S. Supreme Court has already decided in Heller than requiring a weapon to be kept in a state that renders it useless for defense (requiring it to be locked up) is unconstitutional