BI on base steal Inconsistent??

[tibear]

Just a quick question to see if anyone knows why the rule for BI on a base steal seems to be inconsistent.

i.e. Less then 2 outs:
R1 attempts to steal second, BI called on the play. Batter out, R1 returns to first.
R2 attempts to steal third, BI called on the play. Batter out, R2 returns to second.
R3 attempts to steal home, BI called on the play. R3 out, Batter remains at plate.

2 outs:
Runner attempts to any base, BI called on the play. Batter is called out and inning is over.

Why does baseball have the rules written to be inconsistent? Was there a problem with teams trying to run a set play to steal home with BI and this was created to "over penalize" compared to other bases??

I've always found that consistency is always the best way to enforce rules, so why the inconsistency with regards to this rule??