I don't think you have much of a point here. A life without passions, e.g love, hate, joy, anger, enthusiasm... what's negative enthusiasm btw? I don't get it. Anyway, a life without a little of all these plus others is not worth living... I mean there many ways to die but one of the worst has to be dying of boredom. Plus total apathy is also a form of craziness so... You don't even avoid being crazy which seems to be your main point.
Well, you have to take what I say here with the caveat that I've acknowledged that my way of dealing with having had no middle settings as a youngling is not for everyone, very possibly including me. I borked my emotions at an early point and am still trying to undo the damage. My feelings on feelings are those seen through a cracked and dirty lens.
Also, you're literally talking about what I would consider
moderate levels of enthusiasm, (yes, it's perfectly okay to enjoy stuff) while I'm talking - or trying to - about irrational extremes.
It's an extreme when you love something so much that you have to tell everybody else how wrong and bad they are for not loving it at your level. Or when you hate something so much that you have to let everybody else know how wrong and bad they are for not hating it at your level.
It's like, have you ever read a FB post about something a bit fannish, or a sponsored post with a bit of celebrity gossip/information that pops up on your feed, and people respond, discuss the topic, displaying normal, healthy levels of enthusiasm? "Aw man, they broke up?" "Sucks for them." "Hey, Popeye's just tweeted that their viral promotion has been so successful that they actually ran out of chicken sandwiches!" "Really? Damn, I wanted to get me some."
Then there're the people who just LOSE THEIR SHIT over the same post/event (these are the people my local morning radio show make fun of). You know, "Josh and Susan BROKE UP??? MY CHILDHOOD IS RUINED FOREVER! EVERYTHING SUCKS NOW!! I went to Popeye's two weeks late for the chicken sandwich promotion and they were out of chicken sandwiches! I AM NEVER GOING TO POPEYE'S AGAIN!!! YOU SUCK if you don't #BoycottPopeyes!"
Even better, there's always that ONE person who just HAS to post "Who cares? I don't care!" Because that person has no NEED to post that they don't care, they could just have scrolled past the post and gotten on with their lives. But they VERY MUCH NEED everyone to know JUST HOW MUCH they DON'T CARE. And they need YOU to know just how much YOU SUCK for having any interest in the topic whatsoever.
It's those people.