God I hope not. Those things are annoying ...
Annoying, perhaps. But, attention-getting. Which is the point.
People can take a pill, if they get too bummed. (Far too many reactionaries in the world, as it is.)
But if it aids in detection and increases the likelihood an attention-wavering person will see the need to slow/stop, then it ought to be a worthwhile feature.
On a bicycle, I frequently ride on some roads that have much-reduced lighting along some stretches, due to dappled sunlight and a great amount of foliage on the trees. Having a bright flashing taillight and a bright random taillight helps in noticeably increasing the space of vehicles passing me from behind as well as noticeably reducing the incidence of close-following vehicles.
On my own vehicle, there's a console setting to select whether to do a three-flash brake light or a steady-on pattern. Since going to the three-flash mode, I've noticed fewer cars brake dangerously closely (under similar circumstances). Hard to know for certain, in either the bike or car case, but it seems to be so.
I'm sure it'll vary from place to place dependent on the level of disregard inherent in much of the driving population, and very possibly by which vehicles implement such features (ie, some are bright, while some have pointless or even deliberately-dimmed lighting levels). Couldn't say. But it seems to work better in my area, for my car and bike.
On a bike, a couple of these go a long way toward being seen:
cygolite.com