Using of sockpuppet simply signifies 2 points.
1. They think that broken part of trust system might be used against them.
2. Their main account has no credibility left and even a "Brand New" accounts look more credible then their main account.
I think it's
3. Trolling.
All those sockpuppets provided exactly zero (0) facts or other tangible details as to what the actual problems are, if any. Just some generic rants.
4. When you are evading the ban and main account cannot post due to ban .(One of the possible reason)