I am sorry but I find this such a strange story
You see a few weeks of strange behaviour on your account and do nothing about it?
" I got several emails asking to approve withdrawal addresses I never triggered." This should have triggered all your alarms!!
Then 2 FA authorization failed to you.
Several wallet approval requests coming from Kraken disappeared to your spam folder, but not the one you approved "in a rush"
And last but not least you blame Kraken to have an employee who must be the bad guy that took your XRP
If I was a bad guy working at an exchange and had the possibility to do this kind of illegal things risking my job and a huge prison punishment then I would have robbed an account with enough to be rich for the rest of my life, not some lousy 85000 XRP
And then NOT Kraken with its "weak security" and "bad guys" gives you a refund but Binance does?