Reason #1 is I'm not sure they have electric chairs small enough for cats yet!
Reason #2 cats will be cats and that's that.
I have an ongoing problem with my 3 legged hellion Impy who whizzes on everything he can. I know the biggest part of is problem is he's picked on by a few of the other cats, so he retaliates in his finest fashion GRR! And having 3 legs does not stop him from climbing on counters etc. Is there a room you could segregate Sterling & Lucas into until things calm down? I have had to resort to keeping Sweet Pea (PEE?) in the bedroom so she doesn't pee (and sometimes poop) on the counters...she's another low cat on the totem pole. She's happy and relaxed, does not pee in the bedroom, so it works well for us all. I invested in a Hoover Steam Vac a few years ago, and I have to say it works wonders! It sucks the pee out (along with other nasty bodily icks) instead of spinning it around like a shampoo machine. And it has upholstery/ stair attachments too. Our 120 lb. dog Greta has UTIs sometimes...and talk about flooding! I highly recommend them.