What is the best explanation for why it is difficult to write a sixty-second public service announcement?

It is difficult to write a PSA or a Public Service Announcement that operates in just sixty (60) seconds because you have to consider a lot of factors into writing it. First, you consider what message you want to convey. Second, you consider what kind of audience you're targeting. Lastly, you have to make sure that the PSA will effectively convey the message to the target audience in such short amount of time.

It is difficult because your on a timely manner and you need to entertain a variety of audiences