Purity is only attainable between yourself and your creator. In our reality 'things' need owners, owners who are good stewards of the property.
It's kinda like money which in itself is not inherently evil but a necessary store of value to facilitate trade. Paper money being another subject all together.
Only reason I don't own anything is because if I did the IRS would seize it but on the plus side it helps me to be more pure with my creator rather than tempt myself over bad stewardship.