To those denying institutional toxic cultures exists in the police, or even at all, let's try and simplify it.
Imagine you have a work WhatsApp group. Maybe you already have one. Imagine a colleague sent you a picture of them taking a selfie next to a dead body.
How would you feel? Shocked? Horrified? Would you report them? Call them out? The answer is probably yes! Because presumably you're a decent person with morals and you wouldn't find that funny or acceptable.
You also presumably wouldn't take that selfie yourself, for the same reasons above. And if you did, I imagine your colleagues would be horrified, right? They'd probably report you to the boss?
Two police officers actually did this. They sent a selfie of themselves with two dead sisters to their colleagues. They did this because they didn't have the same morals, fear of repercussions, and decency as you would. They thought it was funny - but most importantly, they knew that when their colleagues received this, they'd find it funny too and would do absolutely nothing about it but laugh.
Now, do you think it's a coincidence that so many people on the same WhatsApp group -From different backgrounds and walks of life with different humours and personalities - happen to have low morals and wouldn't, like you, report this, and also work for the same place?? Is it coincidence that so many vile people have congregated together in this group, or is it more likely that this the result of a toxic, immoral and dangerous workplace culture?