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Why do you feel the need to invade your SO privacy? Your basically saying if you want to date me you have to be willing to give up your personal privacy..... thats borderline abusive.  Healthy people talk about and work out their insecurities.... they dont feed them by snooping into people phones to find out if theybare talking shit about you.
It's an invasion of privacy ofcourse it's wrong, if you look through their private messages without their permission that's very very bad
They're called private messages for a reason >

For the beginning of any relationship, I agree. It is weird and presumptive to insert yourself into the conversations and relationship that your partner is having unless and until they invite you in.
That said, as someone who has been married to his partner for 8 years (and in this relationship for over a decade), it feels curious to me to think of a long term relationship in which there are forbidden conversations that your partner is having that you aren't allowed to hear. My wife and I pick up each other's phones all the time, mainly because we find the texts that we send and receive hilarious. There is nothing in there that we wouldn't say to each other's face, and if our friends want to say anything private to us they would do so in person or over a phone call. 
Obviously different people have different relationships that can be healthy, and maybe this is partially a generational thing as someone in their upper 30s, but it is personally hard for me to imagine a healthy decades-long relationship that I would be in where my partner wouldn't trust me to look through their phone for amusement. >

Yeah, I feel similarly, although I know some conversations should be "off-limits" e.g. because they deal with someone else's issues. So, for instance, my wife will tell me "please don't read X chat, because that's where Marie's venting about her issues" and I think we should respect not because our SOs' privacies, but other people's privacies. >

Upvote for unpopular. I feel that if you need to look through your partner's phone, it shows a level of insecurity and distrust that makes me question the relationship as a whole. >

Okay but what about the people that DO find shady shit? Nah man. Uncool. >

If you have enough suspicion to go snooping in the first place you should already have left that person, the actual evidence is redundant if you already don't trust them. >

Not always the case. But ok. >

Seems logical to me.  If you don't trust your partner to the point where you have to get visual confirmation they aren't cheating on you, how strong is your relationship really? >

So your partner comes home on a regular basis smelling of someone else’s cologne/perfume. They insist that it’s because their workplace culture is to give hugs and that must be the case. You grow suspicious when he/she starts pulling away from you emotionally. You ask about it and they say that it’s no big deal and trust they’re really stressed from work. 
You either: 1. Completely believe them without reservation or 2. you dump them since you no longer trust them.
The logical middle ground would be to do some basic snooping to see if there is any fire where one can smell smoke. >

"logical middle ground" my ass. How about the two of you start talking to each other💀
But nah who cares >

"snooping" literally implies wrong doing. If you are just looking at their phone with permission its not snooping lol >

Exactly! 
I had an ex who literally said “you can go through my phone whenever you want. Idc. I have nothing to hide.”
does that randomly and finds out he’s been cheating on several occasions
Him: I’m afraid when you even pick up my phone now because you’re always snooping.
No sir. It’s not snooping you gave me permission to do so.