Are Jordans retaliation executions of isis prisoners the way to go?

While i oppose capital punishment in the UK because of the fear that the state could be wrong, there is much less ambiguity with ISIS. People that join ISIS are joining a terrorist group which implicitly wants to harm us.

So yes, i support the execution of ISIS members and frankly would support them being shot on sight.

We may not be able to remove them completely (requires a ground occupation in pretty much the entire middle east and probably breaches of just war - civilian casualties) but states like Jordan can send a message that if ISIS hits them, they'll hit them back.