We’re better off being idealists (and out as such, since we’re open books).
So long as you can convey that you are the right kind of idealistic. That is, it is important to be clear that cooperation is conditional. Because it is just a pain in the ass to actually have to @#%# people over when they try to defect. (Even thought it is sometimes profitable!)
Make it obvious that you will not keep being nice to them regardless of what they do. If they ‘defect’ then ‘defect back if convenient’ is the ideal that you hope they will attribute to you.
Some of them, for sure.
So long as you can convey that you are the right kind of idealistic. That is, it is important to be clear that cooperation is conditional. Because it is just a pain in the ass to actually have to @#%# people over when they try to defect. (Even thought it is sometimes profitable!)
Your cooperation or theirs?
Make it obvious that you will not keep being nice to them regardless of what they do. If they ‘defect’ then ‘defect back if convenient’ is the ideal that you hope they will attribute to you.