They wear military uniforms; they are frequently armed. Never forget what that implies about their training and orientation toward the universe. They boldly go.
To the point: he and his people were kidnapped and being held by force by an unknown entity with undefined powers. All indications were hostile, Zefram notwithstanding. A test of strength via force even before diplomacy was IMHO very Kirk-like.
Side note: the ill-fitting orange jumpsuit worn by Zefram shows up in dozens of episodes in multiple colors (my personal favorite is the administrator in The Trouble with Tribbles).
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