All admins are different, and handle situations differently.
If you have a problem with somebody on the server you always always have the right to contact us, so you can tell us what's wrong. Please do so by using @ in team chat to inform us.
Complaints that you may have go in the dropbox, as said above.
Population pretty much said it - Some admins use admining techniques different then others, such as instead of a all-chat warning they might private message, or 'psay' them instead.
With Jail it isn't always easy to tell whether something is a freekill or not, or just if a player is new to the gamemode, and we can't (or at-least shouldn't) take direct action based off a player saying someone freekilled. A general warning could be issued just in case, but a direct/specific action (IE revoke or player-specific action), likely not.
Also, freekills often happen by mistake, or not on purpose, since it can be easy to misinterpret orders/jail-rules, particularly since some servers use different rules/judgement calls then others.
----
Something I've always thought of is: Without players, there wouldn't be active servers. Without active servers, there wouldn't really be a clan/community.
What I mean by this is that there are times where being a 'strict' admin is needed, but it shouldn't be needed all the time. Otherwise it's easy to lose the server population, if not the server as well. Hence why I tend to give multiple warnings/chances for things that are usually minor slip-ups - We want players to have fun and continue playing on our servers, but at the same time we don't want to permit/allow players that are excessive, if that makes sense. (And this coming from personal experience with previous communities as well)
----
But either way, if a admin is in fact not admining something when they should, contact a leadership member about it. That being said, if you're not sure if a admin knows something happened, let them know of it with the method population & iSimon mentioned about teamchat and the @ symbol. (Example for when you're in teamchat (without the quotes): "@ Player1 is baiting the T's" or "@ Player2 just freekilled me while following orders"
Just my thoughts on the matter.