Experienced computer users are aware that Flash advertisements and banners displayed on websites can host malware code that can infect those who click on the corresponding boxes.
Users prefer to block Flash components using dedicated software applications that will not allow the code to run.
There are also valid and harmless videos that are based on Flash and that will become accessible once the user chooses to disable the protection.
These dedicated utilities are typically browser add-ons which allow users to unblock certain websites permanently or temporarily, as long as they are believed to be safe.