That's just not what the word purpose means. Take your example:

> If I start living in my van to renovate my house

Keyword here, "to". "To" imbues the purpose. If you then completely fail to actually do the renovation, sure, that's absolutely a problem, but the van's purpose was still to help you renovate the house. You just happened to fail at it. Intent matters, and the comment I replied to implies a whole lot of malicious intent that is more likely just incompetence or unpredictable outcomes. The difference is important in understanding how to address the issue.