What are your thoughts on taxes on income from assets?

In the uk, the labour government has hinted at raising taxes on income from assets such as rental income. It’s very divisise, some people like it because they claim it’s good to tax rent seeking behaviour and therefore discourage it and thus more people will invest their money in wealth creation activities. Others are against it because many boomers use rental income as essentially there pension. Young people are generally in favour because most of them rent and rent is usually there largest expense and rent is unaffordable to many. What are your thoughts on this?