NOTE:
Each opinion listed has attached personal statement from Jonah Haines.

Chaos Insurgency; numerous reasons.
"Bunch of lawless terrorists running around trying to kill me and unleash otherworldly, bloodthirsty, potentially planet-destroying anomalies? Yeah. No thanks."

Unnecessary Bureaucracy; conflict of morals.
"Look, I get that the Foundation runs on rules and procedures, but when we're arguing about numbers on a page instead of stopping an SCP that's trying to turn reality inside-out? That pisses me off. It's like, we're trying to stop an XK-Class event, not file TPS reports."

Senseless Loss of Life; conflict of morals.
"We deal with dangerous stuff, and sometimes casualties are unavoidable. But someone dying because of incompetence, ego, or plain stupidity, it just sticks with me. We're supposed to be the good guys."

Being Lied To or Kept in the Dark; distrust, views as disrespectful and dangerous.
"Been there, done that, got the mental scars to prove it. After what happened in Yemen, I'm not into being fed bulls**t by the people in charge. Just be straight with me. "

Class-D Personnel; ethical concerns, cooperation issues
"I'll start off by saying, f**k 'em. Anyone who managed to get selected for Class-D deserves every horrific death they may run into here, and they deserve it quick. Some of them have decent senses of humor and some are cooperative, sure, but most of have personalities and listening skills on-par with their crimes. Terrible."

Overly serious individuals; personality confliction, views as "stressful"
"If you can't find a little dark humor in all this cosmic horror, you're gonna crack. Gotta laugh to keep from crying, you know? Some people need to lighten up before they turn into SCPs themselves – SCP-Too-Serious. Get it?... Sorry." 

Memetic SCPs; personal experiences
"The mind-bending stuff? That's the real nightmare fuel. At least you can put bullets in a monster; try re-containing something that makes you think your own memories are a lie."

Being underestimated; views as insulting
"Yeah, I crack jokes when I probably shouldn't. It's a coping mechanism, not a sign of weakness. I went through hell to get here, and I can handle my own. Don't mistake the humor for incompetence."

Alaska; temperature preference
"Why do I not like Alaska? Let me hit you with a counter question. After spending most of your life in the most scorching hot areas of the world, would YOU enjoy working in constant negative temperatures? Where you're constantly covered in snow, where the air you breathe is so cold it feels like razors in your lungs? No, didn't think so, either."

Internal Affairs; personal differences
"I understand they're just doing their job, but man, are they just fun police sometimes."

Quiet shifts; N/A
"Sometimes they're a welcome break, a chance to decompress. Other times, the silence is just… unsettling. I've learned to never trust when a chaotic location suddenly goes quiet. Depends on the day, though."

MTF ν-7 "Hammer Down" personnel; similar values, views as personable.
"Those guys are alright. They kinda remind me of the Army guys I was stationed with in Kunsan. Not gonna explain how that is though, they probably wouldn't like it."

Occasional Docile SCPs; views as intellectually stimulating.
"Yeah, the ones that aren't trying to kill us? Some of them are actually pretty interesting. Like a really messed-up science experiment that just wants to be understood. A nice break from the usual threats. Except that bear. That f**king bear that I hate." 

Genuine Camaraderie; views as supportive and essential.
"Through all the blood and the confusion, the people you trust to watch your back, that's real. Those connections are what keep you from completely losing it." 

MTF ε-11 "Nine-Tailed Fox" Squad-73 personnel; views as family
"If there's any group that embodies that genuine camaraderie I mentioned, it's this group of people. Squad-73. Took a while to find a squad where the humor lands and everyone's got each other's backs, even with all the otherworldly things we deal with. They're alright. Actually, they're more than alright. They're the closest thing to a family I've got in this s**tstorm. Wouldn't trade 'em."

Helping others; believes is his core motivation.
"Sounds twisted, I know. But knowing that we're preventing something truly awful from happening to the outside world? That's what gets me out of bed in the morning, even after the nightmares."