Problem player walks out after rolling a Natural 1 (REMASTERED)

Updated version of my previous post cuz people keep shitting on it for being too long :p

I used to DM for our Wednesday group, and during that time one of our players who I'll call Murphy was our problem player. he wasnt ever too bad except for a few select moments.

Fast forward about a year after I started DMing this group, and another player took over as DM and I became a player. During that time alot of the things Murphy did still annoyed me but were mostly not that awful, until he ended up dropping the campaign because it “Needed more chaos”.

A few months after this, me and a few friends decided to get our Tuesday group up and running. While we gathered people to play, I specifically mentioned to everyone not to invite Murphy as I did not like playing with him. We got our group together, and started playing every week for about 4ish weeks, with me as the DM. Things were going well.

Then one day, randomly Murphy walks into the building, sits down and says he's here to play. (Keeping in mind we play at a game store)

I didn't want to let him, but he's a close friend of mine out of game so I didn't want to say no either. So I ended up letting him join. He made a Rogue, which I shuddered at considering I knew he liked to get up to mischief.

The first few sessions with him go alright, with some minor hiccups. The big one being that he started pickpocketing the other players, so our group ended up adding a rule that said no players are allowed to mess with other players inventory without permission.

The main problem comes in on session 4 with him. In the previous session the group hired a bodyguard to help with the next few fights.

During this session, the group ran into a merchant in the woods whose caravan was being attacked by goblins. The group started trying to help, when our Wizard jumped in and used an AOE spell targeting the merchant. Although it missed the merchant, it did hit and kill the Goblins and the merchant’s horse. Then the bodyguard who had a neutral good alignment stepped in and argued with the wizard for killing the merchant's horse.

The argument ended with the bodyguard calling the wizard crazy, and preparing to leave the group. That's when Murphy stepped in and made a pickpocket check to “Get their money back”. Hysterically, he rolled a nat 1.

When he did, the body guard turned around and took a swing at him with his sword, and the moment I said this Murphy got up, cleaned up his stuff and said something along the lines of “This isn't fun, he shouldn't be attacking me, we are paying him.”

After he left, the rest of the session went rather well. The wizard paid the merchant for a new horse and all was forgiven, until afterwards when I checked our group chat.

Murphy: “That session was bullshit. Why can't we do the things we want?” Me: “You can, I didn't stop you from trying to pickpocket the body guard, and I didn't stop the wizard from blowing up the merchant. But actions have consequences “ Murphy: “It's just a game though.” Me: “Yes but if you do evil things you shouldn't be mad when bad things happen to you” Murphy: “Can we do ONE campaign where we aren't heroes?”

That last line really irked me because the group has been the furthest thing from heroes during this campaign, which is fine but not only that but Murphy joined our group uninvited. And now he's demanding we play a different way?

I explained that to him and his only response was to leave the group.

Our group has been going strong since, and tbh has been much better off without him. Which sucks cuz like I said before he's a close friend to me irl, but it is what it is.

TLDR: Close friend of mine invites himself to our D&D group, becomes a problem player then leaves when there are consequences to his actions.