With regards to the freezer killing bacteria, it actually just slows em' down. I mean it does not kill the stench nor the bacteria, unless your freezer can be set into deep freeze mode. So what it does is that it knocks out the bacteria but as soon as they're out of the freezer, they're right back at it like an addict...
The bacteria gathered in long term actually start to corrupt the fabric. So while wearing jeans without washing them will ensure you nice fades it might also result in the jeans breaking up faster. So wash your jeans people.