In a nutshell.
Reasons cats should be allowed outdoors:
- They need fresh air.
- It is mean to keep them trapped inside.
- They need to hunt.
Reasons cats should not be allowed outdoors:
- They harm native bird species.
- It statistically shortens their lifespans, via accident, predators, and/or disease.
- it is irresponsible to allow your pet to defecate somewhere you can't clean it up.
- It is irresponsible to allow your pet free access to other people's property.