what does the phrase 'halt mass murder' mean?

[shu]

English Language Tests, Intermediate level

ESL/EFL Test #155 "Compound words: aftermath, afterthought, afterbirth", question 4

It is better to halt mass murder than to clean it up ..........

(a) afterthought
(b) aftermath
(c) afterwards
(d) afterlife

English Language Tests, Intermediate level

ESL/EFL Test #155 "Compound words: aftermath, afterthought, afterbirth", answer 4

It is better to halt mass murder than to clean it up afterwards.

Correct answer: (c) afterwards

Your answer was: incorrect
It is better to halt mass murder than to clean it up afterthought.
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sorry, I don't really understand what the ' halt mass murder' means. could you please explain it?

shu

[Lost_Soul]

To stop/prevent mass murder. Mass murder is when you kill a bunch of innocent people.