Final answer:
The expression about a $600 coat potentially making someone a target for theft or violence reflects how visible wealth can affect personal safety. Similarly, the post-9/11 security measures illustrate the high costs associated with ensuring public safety, such as employing sky marshals and upgrading airport security systems.
Step-by-step explanation:
The question seems to be considering the risks associated with owning something of high value, like a coat that costs $600. In a societal context, such an expensive item can unfortunately make an individual a target for theft or even violence, hence the expression that it "can get you robbed or killed". This is an example of how economic status and visible signs of wealth can affect personal safety.
Looking at the broader implications of large expenditures for safety, the costs associated with improving air travel security after the terrorist plane hijackings on September 11, 2001, are a good example. It was proposed that the federal government could employ measures such as providing armed "sky marshals" on every flight, retrofitting planes with reinforced cockpit doors, and upgrading airport security equipment. These measures collectively represented a multi-billion dollar investment in public safety, showing how societal protection comes with significant costs.