People need a place to live. It is driving so many problems in our society that they don't. Sprawl causes massive CO2 emissions. Homelessness. People forced to move away from where they grew up. Businesses that struggle to hire.
And "my" backyard is accurate: people being told by others what to do with their own property is a big part of the problem. If it is your backyard, no one is going to force you to build anything in it.
Clearly, not all new development is perfect and awesome all the time, but one thing we used to do is to allow it: and then, crucially, allow it to change and adapt over time into something better.