This isn't about putting a cause or blame on the accident. These changes are brought in to reduce the chance of the accidents happening in the first place. Whether or not you choose to believe it, speed is a major factor in determining how quickly you stop when someone steps out into the road. The lower your speed, the more chance you have of stopping in time. Sorry for being patronising mate.
Stopping the pedestrian from stepping out in the road in front of the car will reduce the risk of accidents far more than dropping speed. It is the pedestrian entering the road incorrectly that causes the accident, not the speed. Sorry being patronising, but this is simple. If you want to reduce the number of accidents, tackle the cause of the accidents. You want to tackle something that might help drivers avoid the cause, it would be far more successful to tackle the cause directly.
As for stopping distances, car design, structure and weight play a much greater part in whether any particular car/driver combination can stop in time for a pedestrian. My Audi can stop in a shorter distance than my micra, and both can stop in a signifincantly shorter distance than a 15 year old shopping car. This gets more and more noticable as speed increases.
On the old old top gear, they did a comparison of the base model 106, against the 106 GTi. The GTi stopped, from 70mph, in literally half the distance of the base model. Clearly, speed is but one small factor in whether you can stop.
You seem to be of the impression that these changes are in place because the powers that be have decided motorists are responsible for the accidents. This simply isn't the case, nor are the new laws trying to suggest that.
They clearly are, because that's what they are doing. That's also why they have had, and will continue to have, zero impact on the number of accidents that occur, and only marginal impact on their severity.
To tackle the problem properly, you need to tackle the root causes of accidents, that's where our road safety policy is consistently failing ever since the introduction of the speed kills lie, and why more people than necessary are being killed or injured every year because of it.
These changes aren't an accusation against your responsibility as a motorist, they are an effective method of reducing the chance of an accident happening. And they will remain to be the most effective until a perfect world evolves whereby all pedestrians are of good judgement and responsibility.
They are not though. Speed is only a causal effect in around 5% of accidents. That means that any attempt to reduce speed can only reduce the number of accidents by a minimal amount. I'm sorry you've fallen for the lie, but do yourself a favour and take a step back and look at the situation objectively.
If you want to reduce accidents, the solution is to tackle the causes of accidents.
Stop trying to find someone to blame. Accept that accidents happen. Do your best to avoid them.
True accidents very rarely happen, there is usually someone to blame, hence why education and enforcement of trying to reduce accident causing behaviour (based on the solid evidence and statistics the government pay to have researched each year and then ignore entirely) will yield much better results.
You seem to think I'm looking for someone else to blame, I'm not, I'm looking for improved road safety, and a reduction in pointless laws that are not fit for purpose. The current obsession with speed isn't backed by facts (in truth it's completely refuted by them) as a major contributor to road accidents, and as such it provides no tangible road safety improvement to focus on it. To focus on it almost exclusively will have a negative effect, and it has, with the rate of reduction in kills and serious injuries slowing down dramatically since the introduction of speed kills and the reduction in road traffic policing in favour of single purpose cameras that don't target risk factors.
We both want the same thing, you're just going completely the wrong way about getting it.