Considering helium is a finite resource on earth, it should be made illegal to put it in a party balloon.
If there is a reasonable downside, probably no? You have a right to try to keep yourself alive, in nearly all contexts.
The problem is not that it's finite, the problem is that by the time prices rise enough to discourage people from using it frivolously, you might already be dangerously low on it.
Helium could be made with nuclear fusion, but a 1 Gigawatt nuclear fusion plant would only produce 200kg of helium per year, so it's still not a viable path to make the quantities of helium we currently use. Current usage is almost 30 Million kg per year.