I think we should distinguish between the feature being good/hated:

1. An automatic translation feature.

2. Being able to submit an "original language" version of a post in case the translation is bad/unavailable, or someone can read the original for more nuance.

The only problem I see with #2 involves malicious usage, where the author is out to deliberately sow confusion/outrage or trying to evade moderation by presenting fundamentally different messages.