I wouldn't feel guilty if I robbed a bank. B4stards spend enough time and energy robbing us to pay their chief execs. Also if you assassinated the queen I should imagine it was a planned heist and therefore guilt wouldn't feature.
The kitten on the other hand, well maybe, particularly if they had spent time and money installing a cat flap for their now flat cat. I'd offer to refund that at least.
Maltesers. Mmmm. Yummy. Don't do guilt its a destructive emotion.
P.s I wrote all of that just so I could write cat flap for a flat cat. I take my amusement where I can find it