Final answer:
Julian may use crass vocabulary to defend Frank in an attempt to make a more impactful argument, but such language can undermine the justification of Frank's actions and may not be effective.
Step-by-step explanation:
When considering why Julian might use crass and insensitive vocabulary to defend Frank, it could be that Julian feels this type of language may be more impactful or relatable to the audience, or perhaps it reflects Julian's own emotional state and informal nature of his speech. Julian's attempts to justify keeping Frank out of jail could involve arguing that Frank's actions were a result of external circumstances, such as a difficult upbringing or associating with the wrong crowd, rather than inherent maliciousness. However, the impact of Julian's language on justifying Frank's actions can be double-edged; it might humanize Frank to some but could also undermine the seriousness of the discussion to others. In general, crass vocabulary is not reliably an effective tool for justifying someone's actions as it can polarize the audience and potentially detract from the argument's credibility.