I can see where Insto is coming from on this. You fit the limiters and yes, hurrah, it stops people speeding. But people will still take risks. They'll think 'that gap is big enough', or try to overtake before a curve in the road or before a blind dip. In the past they'd have accelerated to 90 and been gone. Now please, please, please, I AM NOT SAYING THAT IT IS RIGHT FOR THEM TO DO SO!
So with a limiter they go for the same gap, only they hit the limiter, and suddenly that gap isn't as big as it seemed, or a car 'appears' from round the corner or in the dip. Braking is definitely the only solution as you can't speed up - and having seen many many cases with people cutting it fine accelerating out of that situation seems to be the default, it's up to tghe other person to brake, but now they have to brake, but it takes a second longer for the brain to compute, and the vehicle being overtake brakes in panic (because that's the default for the driver in that position).
Of course after a while people will learn and realise, and it's something that could, should, would get into the psyche of every driver and make the majority actually think before making such an overtake. But before we reach that tipping point there genuinely IS the chance that it could increase the number of incidents.
We do have to realise that there's a fundamental fallability in human nature that means we make mistakes, we can't eradicate them all. We can make things better, but you'll never get rid of every single SMIDSY, or daft overtake, or close pass, no matter how much you legislate, enforce or require through technology.
Of course the majority of the shouty people complaining about it simply want to be able to drive fast, the 'more accidents' is probably a convenient excuse that they haven't actually thought through.
And despite the above I'd have no problem with them bringing these in (they were actually covered on Top Gear or Drive about 15 years ago and the same overtaking query was raised, but it shows how long the technology has been around). Have to make sure the technology does really work if it's a genuine limiter that will slow you down - as mentioned above GPS has its quirks and there could be trouble if you're on a 70mph motorway and pass under a bridge that has a 40 limit and the computer hits the brakes.