Hello,
Thank you for the report.
After reviewing the evidence, i'll break it down similarly to how you've presented it:
So just to clean up something, if you walk into a base you're able to be killed as you're tresspassing on owned property. You don't need a KOS sign to kill people entering your base.
I'll go through each screenshot now, with the numbers referring to the numbers listed on the report.
1) You're inside the base, tresspassing, you don't need a KOS Sign to kill someone entering your base.
2) As for dying to an explosion, i'm not really sure who killed you here so the best advice for next time is press F1 and submit a report for RDM.
3) You're breaking NLR in this screenshot, returning to the area you died in. Doesn't really show him killing you, just staring at you with full health.
4 & 5) Again, a KOS sign isn't needed for killing a player tresspassing into your property.
As for any verbal abuse from the users or staff, if you could add me on steam we can talk about ways of catching them doing that next time as we cannot prove it now.
My Steam:
www.steamcommunity.com/id/IamLeperMessiah