I'm gonna try and be as thorough about this and give my opinion as an admin who's been here for over half year a now and a member for around 2 1/2 years, this might be a little lengthy so sorry.
There are moments when people join and kill 1-2 people and then leave but that is not enough reason to ban someone for RDM and Leave because as an admin you have no idea why that person killed those players and you also have no idea why they left the server because it simply could've been their internet crashing or their parents busting in their room. Unfortunately there are going to be less admins than usual because of summer ending so that results in 1-2 admins trying to control the server and be able to handle and punish 4-5 rdmers at a time which is extremely hard so they're simply overwhelmed with the amount of spectating they have to do. Majority of our admins who are very active know of such rdmers who join just to cause issues so they aren't as lenient as they are to players who simply don't understand the rules. You can't say our protocol needs to be more severe since we've always have had this protocol and it's never been an issue since it always resulted in some sort of punishment.
THERE IS A PROTOCOL WE ARE REQUIRED TO FOLLOW SO CLAIMING WE NEGLECT TO DO OUR JOB IS INCORRECT.
There is ALWAYS a way an admin can be contacted both in the server and outside the server that I'm sure you are well aware of which is our "!calladmin" feature which pings any admin that happens to have that server notifications on and plenty of them "farm" the call admins. You can also type in team chat with the "@" sign before what you have to say if you need to speak to any admin that happens to be on the server at the moment and 9/10 admins will respond back in admin chat saying they'll spectate the guy so saying admins are negligent just is not true in my eyes.
There is literally a subforum under Player Complaints that we worked on walking you step by step on how to record rule breakers and I personally always take my time to answer any questions that players have when it comes to recording players or any rules that there are. There is no way to be more severe for punishment except extending the amount of time the person is banned which we already do for players who are known rdmers. A preventative method that there could be is simply letting admins know that there is someone breaking the rules instead of saying "OMG he rdmed me" try talking to us and explain the situation and we will handle it appropriately.
Personally I don't use my mic that often because I don't find a reason to unless I find it absolutely necessary like to call someone kos or to deescalate a situation between two members, because sometimes I just want to play the server without being targeted by other members just because I'm an admin. Yes, having members interact with each other is a good thing that every server should have but I believe that our server tends to have times throughout the day where you have the mute sweats and the talkative members, but personally I think the majority of our players interact plenty enough because whenever I'm online there's always people talking. But like you said you aren't a sweaty try hard and that's your own personal play style and you can't force others to play like you so claiming this an "issue" is pushing it in my opinion.
I will agree the server crashing is never a good thing and that's why we try our best to make edits to any plugins or remove any maps that result in the server crashing, no one's server is 100% stable even the best communities with the best servers even crash at times. This is something that we work endlessly on trying to prevent future crashes but blaming the crashes on the managers just isn't fair since you don't see the endless hours both @Trazzand @Gentoo put into the server trying to make it as stable and fun as possible.
If I'm being truly honest what you said is coming from a very pretentious perspective