User blog comment:ElectricEnder222/Volume 2 Episode 4 Discussion/@comment-187.39.37.72-20140815005228/@comment-7370418-20140815005751

Blake and Sun found out about the mechs they stole while listening to Torchwick's speech, so people would have eventually known about this anyway once they told someone, so there wasn't any point in hiding it anymore.

Torchwick is a criminal anyway, so surely he wouldn't care about killing citizens in order to kill the two people who would have ended up blabing about the mechs he stole anyhow.