There's a path dependency problem. In principle, had you just been building housing like that all along, investing in housing is not appealing as you shouldn't see significant gains in general. However, now that it is appealing, the investment itself pushes up demand, which pushes up the appeal of investing because now prices are going up, which pushes up demand, etc.

Again, in principle, if you just keep building, the market would eventually sort this out. Of course, in the process, you'll overbuild housing proportionally to the investment demand. Once the investment demand leaves, the market will crash, which isn't necessarily a great plan either. And we are talking about a lot of finite resources being misallocated in the meantime, while the market forces figure this out.

If you'd like to resolve this problem faster than the market would naturally sort it out, and harness market forces to do so rather than naively fighting them, it makes sense to cut out the excess, artificial investment demand in the meantime. Sure, it would be better to have not created that problem in the first place, but, here we are.