Operatives have knife as a fall-back in case of melee closing on them. So no, they are not melee (I am agreeing with you).
PT's are meant to be close range/melee. We're not melee. We're not ranged. We're both. We work best in melee as one of our main skills for tanking and dps is melee range only. Also for tanking: a melee generates more threat, so its in a PT's interest to be right in there up-close and personal.
I said it before: if you want to heal sometimes, or like spamming TM, go Merc. Otherwise go PT. Pyro is way better as PT than as Merc. I also feel PT has more options in PvP with the off-hand choice.