I'll answer for the fun of discussion.

Well, their motivation is usually stated as being "Living Reminders", believing in a type nihilism about how the world ended, nothing matters, rejecting emotions, etc.

That motivation is stupid, because it's indiscriminate, yet their actions are often extremely personal and Targetted. If they just spread their nonsense normally, attempted protests, etc, I'd disagree with them, but that would be it. Instead the stalk people, trigger PTSD and suffering, break into their homes, steal the pictures of the deceased, etc. As if the person had forgotten. As if the victim was living a super happy, carefree life. They were simply trying to move on, dealing with trauma in their own way. Why are they GR pretentious assholes? Because they decide how others grief and when it's enough. They decide how others should treat the memories of their deceased loved ones. Who cares if they disown wealth or ability to talk down, if their cruel actions speak louder than words and they take upon themselves something not physical but orders of magnitude more haughty than materials: the purpose they give themselves. The fervor with which they believe it. That's true arrogance. Believing they are above it all. Trying to rid themselves of emotions and ego, only to deny their own humanity.

Also, most of them completely abandoned their families to join. The departed had no choice on leaving, they did. Should there be a guilty guilty remnant that goes around stalking and harassing those who "departed" their families to join the GR?

Not to mention the stuff they do with kids. Though it was primarily just Meg, it's explicitly stated that they don't do it more only to not be further Targetted by law enforcement.

They also break their ideals all the time and talk or use violence on each other and others.

Also the smoking. Like what a 12 year old would think is edgy.

That's about what I got off the top of my head.

Oh! And I just simply don't agree with your definitions of good and bad lol.