Let's start with something that will seem bland, but will probably infuriate pretty much everyone.

Washington State SSB 6208 Bicyclist Stop Sign Requirements

Kind of a nice law, it lets bicyclists treat a stop sign as a yield sign.  So there are some limitations, you're supposed to slow down to a reasonable speed for existing conditions and stop if safety requires it and yield the right of way to oncoming and cross traffic.  It excludes intersections controlled by lights, railroad crossings and school busses.

Makes sense, I worry how far cyclists will push it, and it's not always quite as clearcut as you might expect.  I have a route I ride regularly with a 3 way stop, one way you can't see very far on.  I've had a situation where I actually slowed substantially only to be surprised by a car showing up at their stop just as I was getting ready to proceed.  Nothing bad happened, but it reminded me that "safety requires" is a rather broad definition and someone will push that too far eventually.  Who will the law protect then?

The other part that worries me is that I see increasing numbers of motorists applying the same logic while driving.  There is an intersection near me where I regularly see motorists going through the intersection without stopping.  I'm not talking "full and complete stop" I mean not stopping at all,  speeds that would be a pretty good sprint on a bicycle.  It's a new trend, and it seems to be getting worse.  My wife didn't believe me when I told her about it at first, then she saw it happen.  Once you start seeing it, you realize that it is far from uncommon.  I'm tempted to do a study and observe how often it occurs, but my guess is that probably %95 of all vehicles obey the law (perhaps roll the stop, but speeds under 2 MPH), %4 only slow to 10MPH, and the remainder proceed through the intersection between 10MPH and 45MPH (it's a 35 incidentally)

Now, is there any harm?  So far I'd say not that I'm aware of, but I've also been cross traffic slowing to a stop and watched a crossing vehicle go right through the intersection.  Yes, they got to the stop sign before me, but that's because they didn't even make a gesture to yield.  The other part is that despite what we would like to believe bicyclists remain invisible to some percentage of motorists.  My fear is that the %1 who blow through stop signs are also the motorists who don't see non-motorized traffic.  I worry every time I cross that street on my bike now, and I come to a full and complete stop.