You can't say Israël doesn't have the right-to-exist just because it's a settler-colonial project. By that logic, the USA doesn't have the right-to-exist either.
Gotchu lefties. Pwned.
Akchually if you're using Latin grammar, the plural of apparatus is also apparatus (apparatūs). 4th declension is just goofy like that.
The -a plural is for nouns that end in -um. Like medium/media.
It's all good just remember: Latin is nerd shit for nerds and it literally doesn't matter.