for the first part, admins can't see anything and they can't just go off what people say. I understand your frustration but thats just how it is. there are some people that think every time they die they've been freekilled and never shut up about it to admins to the point where they have to be muted sometimes. if these people knew about !fk (I don't think many people other than regs know it exists) and it ct banned a person it would be heavily abused to ct ban strict players and people that kill the annoying twats that complain about it for 5 rounds. even though you suggest it should be done manually, people will attack the admins for not enforcing the x amount of !fk reports/# of players rule. a lot of times what one person thinks is freekilling is seen as perfectly fine by someone else, this has happened to me many times and I've realized I was wrong after asking the ct about it. its just not a good idea.
for the second part, i didnt even know this was a rule. unless someones studied the rules and FAQ they prob dont know about this either and i dont blame them. now that this has been brought up and myself along with whoever reads this thread knows about it, the hardest part will be trying to enforce it because as im sure you know there are some people who think they know every rule and wont listen when you try to explain these types of things to them. its really just informing the jb server that this rule exists and making sure people follow it. as mentioned before, if you die because of a second warning shot (1-99 damage) thats on you, but if you get domed for a different order then your frustration is understandable.