User blog comment:MuniLedd/Things that trigger me in Dragon ball Super. ಠ ಠ/@comment-5741122-20170218062135

Reminder that Goku, Vegeta, and Trunks are all exponentially stronger than Buu as well.

And Trunks gathered energy from the hopes and dreams of ALL LIFE on Earth. Not just 30 people. Not to mention Goku and Beheta gave him the remainder of their strength.

Trunks killing Zamasu and how he did it is daily typical for Dragon Ball and all other shonen anime. If anything you should be complaining about what happened immediately AFTER Trunks slicing Zamasu.