Conducting a PowerPoint presentation is a lot like smoking a cigar. Only the person doing it likes it. The people around him want to hit him with a chair.
PowerPoint was released by Microsoft in 1990 as a way to euthanize cattle using a method less cruel than hitting them over the head with iron mallets. After PETA successfully argued in court that PowerPoint actually was more cruel than iron mallets, the program was adopted by corporations for slide show presentations.
PowerPoint is usually restricted to conference rooms where the doors are locked from the outside. It is, therefore, considered unsuited for large rallies, where people have a means of escape and where the purpose is to energize rather than daze.