Kirk can freely calculate or emote...sometimes both within moments. It may not have been originally intended as such, but Kirk's philosophy is a virtually equal marriage of Spock's and McCoy's. (While Scotty is beyond unique so he's never emulated.)
Still, Kirk isn't particularly big on ''fire to frighten,'' as Spock was. The major problem in GALILEO was that they seemed to forget firing to STUN is far more preferable. Assuming, of course, the multiple creatures could be seen in the mist.