Having spoken with more than one traffic safety officer on this, they pick signs with good sight lines because it's safer for them and you to be pulled over at one of those signs.

They don't really care about the safety of the specific sign you're violating. They want you to be in the habit of always coming to a complete stop at stop signs. If you get sloppy at the "safe" signs, some day you'll make a mistake about which sign is "safe," or you'll miss some poorly-lit cyclist on the cross-street, or a pedestrian, etc. Rolling through a right-on-red is particularly dangerous behavior, since most drivers look left for conflicting traffic, and it's easy to miss crosswalk or bicycle conflicts on the driver's right. Stop, look both ways, then proceed.