Perhaps the Government should intervene in some way - just not by putting its fingers on the scale in favour of one side of the balance.
I don't really buy this balance argument, because the situation is inherently not balanced. On one side, the landlord is running a business, and on the other side, the tenant is seeking to meet a basic need, for which - for most people - there is no choice about meeting that need. The tenant may theoretically have a choice of which house he rents, but he has no choice in the fact that he has to rent from
someone. To that extent, it's not a voluntary transaction on one side.
I would see this idea of guaranteeing security of tenure and limiting rent rises not as unfair interference but as basic consumer protection and good practices. Once a tenant is living in a house, it's very difficult and very expensive for that tenant to move (think, for example, of a family who might face having to change their children's schools, pay thousands in removal fees, etc. if forced to move). For practical purposes, most tenants are therefore in a situation where they are effectively locked in to their tenancy, so it doesn't seem unreasonable to expect the landlord to give them some security of tenure and protection from arbitrary rent rises. (And by the way, I'm writing this as a landlord).
After all, there are many other industries for which the Government imposes somewhat analogous restrictions on how businesses can behave, in the interests of consumer protection. For example, water companies have their charges regulated, all utility companies face severe restrictions on the circumstances under which they can decline to serve a household. Rail companies have fares regulated. I don't offhand see many complaints that this is unfair to those companies. In principle, why should housing - which is arguably an even more essential service - be any different?
The only significant difference I can see is that landlords are, on the whole, much smaller businesses. Many are people who have one extra home that they let out (that's my situation) - and so they are obviously far more vulnerable than - say - organizations like water companies. That certainly has the practical effect of limiting how much regulation you can sustain, but I don't think that negates the need to conduct your business in a way that's fair to your customers, and for the Government to regulate that in some manner.
The problem is not rents as such - it is the imbalance between wages and housing stock. Addressing either of those factors would be safer and more generally useful. However, typically for the Labour Party, they are suggesting populist quick fixes that will have only too easily seen consequences.
Well here the devil is in the detail. None of us know exactly how this policy will be implemented if Labour comes to power. It is of course perfectly possible that well-meaning regulation could be disastrous if implemented badly. (
Arctic Troll gave an example: 3 year contracts would be silly if that meant the tenant couldn't move out even if they wanted to). But as a general principle, what Labour are proposing seems fair to me. Others people here have suggested that, far from populist measures that can't work, the concept of limiting rent rises and providing security of tenure merely brings the UK into line with much of the rest of Europe, where this doesn't seem to cause problems. That's my impression too (though my knowledge of that is a bit hazy so I could be mistaken).
I do by the way agree that lack of housing is also a fundamental problem. If that was solved (which requires a massive house-building program and will take years), then the problems tenants face would be considerably eased.