Ok, so you currently stand up, with nothing but a plastic seat, at around your knee level, and a slight gradient separating you from the person in front of you, yeah? Does that feel safe?
Now take that experience, but add your very own rail at the correct height for you to comfortably lean on, whilst also preventing the possibility of you falling forwards during wild celebrations. Those people standing behind you can no longer fall in to you, as they also have their own rail preventing them from doing so.
Does that sound like an improvement?