Kirk is a playboy hot shot who likes to execute bad guys and makes really stupid decisions...
Young, inexperienced people often make poor decisions. Kirk also executed Chang in The Undiscovered Country
. After obviously crippling the Bird-of-Prey, he didn't even offer surrender as an option.
Hmm. That's not how I remember it. Enterprise was being fired upon by a cloaked ship ...
"It's gotta have a tailpipe." "Doctor, would you care to assist me?" "Lock and load, Jim!" "Fire!"
Meanwhile, on Excelsior ... "Target that explosion and fire."
That's not an execution. That's defending your ship and crew from an aggressive, merciless attack. If the aggressor was destroyed in the process, oh well. Bad day for him.
IMO, YMMV, yeah.