Ah! Common ground!
I knew there had to be some.
Agreed: Execution or life in prison without trial are not options.
Agreed: The US is not responsible for hatred of the US, because everyone chooses whether to hate someone else or not.
Corollary to point above: The US (that's us) is responsible for creating conditions that reinforce or give credence to hatred already existing by behaving in unjust ways. Remedy: we cut that out.
Side point: The US is a signatory of the Geneva Conventions. The terrorist groups are not. Our status as signatory obliges us to behave in accordance with the treaty, period, not just when waging war on other signatories. Sometimes it sucks to be civilized, but not as much as it sucks not to be civilized.