IHT is very newsworthy but fiscally irrelevant for the country and for most people. It raises only 0.5% of the UK's total tax take and the vast majority of people don't pay it. For a married couple with a house, the 2nd spouse to die will only pay it on assets above £1m. Given that a few years in a care home will cost you £70k+ per annum per person, even moderately well off people are unlikely to have an estate worth of £1m+ when they die.
Given this I always find it surprising how worked up the right wing press get about IHT. I think it plays well with people who think that the left wing are out to take everyone's hard earned money. (Not true by the way, total tax as a percentage of GDP rose to their highest levels under the Tories, even for the very rich, VAT rising 20% under Osborne was extremely significant)
Taxes aren't really about raising money that the government can then spend - that's not how an economy works, the government has to spend money to put money into the economy first, then most of it comes back via taxes. Taxes are principally a way of encouraging or discouraging certain behaviours. Think cigarette and fuel duty. Progressive income tax rates are a way of encouraging poorer people to work and be productive, but stopping too much wealth concentration at the top (rich people actually spend a smaller proportion of their wealth, cash in the bank isn't good for the economy).
So with IHT you actually want wealthy older people to not hoard their wealth. Piles of cash in the bank are bad for the economy it should be out in the economy cycling round. An elderly couple in a huge house blocks a house that could be better used by a younger bigger family.
So actually I think the current regime with quite a high rate is OK. If it encourages people to trade down their property, give some of their wealth to their kids when it's most useful, buy an annuity that is in turn invested in companies, then it's achieving the right aims..
Of course you'll never get a proper discussion like this, politics and the media has largely been reduced to sound bites. Read the FT or The Economist if you want to understand stuff like this in detail.