There are people in rooms discussing whether "the ends justify the means" (though I don't think anyone is seriously arguing in favor of SBF-type means). BUT THESE ARE PHILOSOPHICAL DISCUSSIONS.
If you asked 1,000 effective altruists if they think what SBF did was acceptable (or gave a hypothetical ends justify the means at 10% of the severity of SBF), I would wager that 0 would say it was acceptable. SBF used EA as a shield to hide his fraudulent behavior, and EA (both the philosophy and application sides) have taken a hard look at what EA argues for, and to think that EA (even philosophy EA) would approve of SBF's behavior do not understand EA at all.
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I study EA and so I am loosely connected to the movement, but I don't consider myself an effective altruist.