Inspired by these two questions Why was Mace Windu Surprised when Jango Fett was Decapitated? and Why did Mace Windu threaten Jango Fett on Geonosis?
For a Jedi, it is more acceptable to capture than to kill. In Revenge of the Sith, when Anakin incapacitated Darth Tyranus:
FROM THIS SCRIPT
Supreme Chancellor: [Anakin cuts off Dooku's hands ending the battle. Anakin catches Dooku's lightsaber and ignites it and puts both lightsabers to his neck] Good, Anakin, good. Kill him. [Dooku looks at Palpatine in shock]
Supreme Chancellor: Kill him now.
Anakin Skywalker: I shouldn't...
Supreme Chancellor: Do it!
Anakin Skywalker: [Anakin decapitates Dooku] I couldn't stop myself.
Supreme Chancellor: You did well, Anakin. He was too dangerous to be kept alive.
Anakin Skywalker: Yes, but he was an unarmed prisoner. [frees Chancellor Palpatine]
Anakin Skywalker: I shouldn't have done that. It's not the Jedi way.
Supreme Chancellor: [stands up, rubbing his wrists] It is only natural. He cut off your arm, and you wanted revenge. It wasn't the first time, Anakin. Remember what you told me about your mother and the Sand People. [sound of sand people screaming in as if Anakin can still hear their death]
This scene tells that it is not the Jedi way to kill, they should be captured. Of course, with the exception of this scene when Anakin killed Dooku on the Supreme Chancellor's orders. But Anakin realize that it's not the Jedi way. So why did Mace Windu kill Jango Fett, considering that Mace Windu is a Jedi Master?