Answer:
More people means a wider variety of people, means some people who harm others
Step-by-step explanation:
The more people you have, the wider variety of people you will have, which means that some will not have strong morals, while others will, which leads to those with lower morals doing immoral things, such as stealing and harming others. With this increase of people, it is harder to directly communicate with these people and get them to stop, so instead laws and enforcers must come into play.