What equality ? They are not equal with clean clients. You know community and some of the bad features are forbidden and not good for the network.
Using leecher features is forbidden, using leecher mods without their leecher functions is not. You constantly seem to mix that up.
Keep that in mind before asking the same question again.

Is there any reason to send data to bad(community mods or any other kind of leechers) clients ?
Yep: eMule is about file sharing, not file trading. If you can share a file, share it and don't care about who actually wants it! This is what makes eD2K/Kad still the largest file database.
File trading (the AJ attitude) would represent the BT approach of sharing as little as necessary, so it hurts basic network rules; which is a fact that doesn't have to be accepted, right?
Yes, so tell me why do you reducing score of some of the clients without any given reason ?
The given reason is that they hurt the "file sharing, not file trading" thing.