iii. If you can choose Oathbreaker at level 1 then you aren't much of a Paladin really.
iv. I'm in the Blackguard/Anti-Paladin camp.
Depends on your perspective - if for you Paladin means LG and thereabouts, then yes, III is true.
I - although a "traditionalist" in many ways, prefer to see Paladins in a broader sense, as "Holy Warriors" available to all deities i.e. allignments.
Unless you go completely off the rails then I don't think you should go straight from LG to CE for one mistake. Some games (e.g. Pathfinder?) give a notice that 'your action has moved you two points to chaotic' or whatever.
Were not Paladins 'traditionally' human only?
Yes, they were. In a context where Paladins had to be LG. And most other races were too Chaotic to hold a Lawful outlook - Elves, Halflings, Half-orcs ...
From this point of view LG Paladins should be limited to Humans -maybe Half-elves too - and Dwarvesy. Although one could argue that Dwarves need not apply due to cultural considerations, i.e. simply "not their thing"
5ed does a poor job here - the Paladin blurb is "anti Evil" but there is nothing saying that I can't be a Paladin of Vengence, my particular beef being against the Seldarine in general - for chasing grandma into the Underdark, or Correlon Larethian in particular - for taking my god's eye out.
