tieflings, infernal warlocks, fire and fear keywords

phb encounter attack spells
level 1, 2 infernal spells, none with fire or fear keyword
level 13, 2 infernal spells, none with fire or fear keyword
level 17, 1 infernal spell, none with fire or fear keyword
level 23, 1 infernal spell, none with fire or fear keyword

phb daily attack spells
level 9, 1 infernal spell, none with fire or fear keyword
level 20, 1 infernal spell, none with fire or fear keyword
level 25, 1 infernal spell, none with fire or fear keyword

also note that infernal warlocks get a grand total of 2 spells with the fear keyword.

now, compare that to a race with +2 con (e.g., half-elf), which enjoys a boost to EVERY infernal warlock spell.

do you still think that hellfire blood makes tieflings the "best" infernal warlocks?

oh, did i fail to mention that a tiefling has to spend a feat for hellfire blood, as opposed to a +2 con race not having to spend a feat for the better benefit?