I guess that one of Ian Smith's problems (besides being an @sshole of the old school type) were that his political power base were to small. Having a small minority trying to controle and supress a sea of humans, is something that requires instruments of power of a different calliber than what the state of Rhodesia could muster in isolation.
Which leads us to our afghan problem. We need to have a political solution that's viable, that can gather surport. Something that on a long term seems attractable to the populations in question. If that, f.ex. in Helmand, is a local sharia goverment then, that's something the Afghan people can decide. Our mission is to make sure that it's the people who decide, and not those with most guns.
Though before we can make long term arragements, we need to establish Order, and that can only be, by neutralising those that fights against order. And I think - rather I am sure - that that fight is not won, far from, by shooting at armed guerillas - how ever good you are at it. We also need to do that, but much more important is it to meticulously destroy the, unarmed, organisation that obviously more or less willingly surport the armed organisation and is it's prerequiste.
The enemy are those that disagree (with us), Enemy combattans are those that in action or public speaking disagree (with us).
Those that are activly disagreeing (fighting, placing bombs, posting posters, fund raising, sheltering, intimidating etc), needs to be caught and imprissoned or killed.
People that speaks out against us, f.ex. in the weekly friday prayer, needs to be silenced or/and replaced.
We need to be able to shield the population from the fear of the insurgents, and we can only do that by "precence" and "policing" (with the object of identifying the surport structure) so that we deny access to the population.
This is easier done in the cities, but it's the "intermediate zone" (the zone between the city and the uninhabbitted areas) that we need to contol. We need to defend and control the villages and the food and provisions they produce.
This is, as Trinquier suggest, done by turning villages into easy defendable and controlable hamlets surported by highly mobile "on call" forces.
Technology has helped us here, since the ISAF forces are/can be highly mobile, leaving it to the much less cabable ANA forces to do the local static defense (that's btw dangerous, but it's their country and it's fitting they take the brunt of the pain). If we deny the insurgents access to the population, we deny them mobility (since the insurgents uses the population as food and provision source, deprived of that, their logistics becomes impossible) .
This might mean that we need to do some population concentration, in the selected hamlets, it's best if it's voluntarely, but even if it's not and if the timescale is not too long, it should be feasable - the hamlets would also be a good point to distribute aid without having to see half of it end up with the insurgents.
We need a massive quick response to force quick millitary victory, then we can start with political reconstruction and permanent solutions.
I am 100% against the hearts and minds approch (which doesn't work since it's not about hearts and the mind is more swayed by fear than joy), in the same breath I am 100% against the "two legs" approch (trying to provide security while rebuilding/reconstruction) since that requires the one commodity we don't have, but the enemy has in aboundance: Time.