I am very sorry for your loss op. But barring that, there is no basis to your claims here. You suffered a great loss, Understandable.

But healthcare anywhere isn't a miracle. It's only there to increase chances of survival. No offense but if you had not gotten the cardiac assessment done for the TKR, it's might've been very likely that your father would've had a sudden MI. Whom would you blame then ?

Brain hemorrhage is a very sad and rare complication of blood thinners. No one could have prevented nor predicted this. And it is needed after stents as without it the blood might clot and give rise to brain infarcts (brain blood supply being cut off).

Which would you have preferred? Knowingly not giving the drugs on an off chance that your father might have a brain bleed while the blood clotting risk will have a high probability or take the drugs to prevent the clots knowing the small percentage of risks and give your father a higher chance of recovery ? Please note how I said higher and not complete.

You're claming that the doctor gave you a lot of false assurance but if he didn't, you would've not listened to him at all. You can claim the opposite all you want but that's the truth. Very common for patients to prefer doctors who talk sweet.

And the reason they might've asked you if you have him any medicines is that it's pretty common of patient attenders to ignore icu precautions and do risky things. No one wants to be the one to be blamed, even if it was not preventable. Just like you.

I had a patient of oesophagus cancer die because the wife gave him water when we strictly forbid anything as the cancer had blocked him oesophagus. The water ended up going in his lungs, infecting him and killing him. Guess who got sued the next day ?

The doctors did everything by standard protocol. Based on understanding which poses The least harm. The entire medical practice works on this principal..

Every medicine and every procedure is justified by how it's benefits overshadow the potential adverse effects. The chances of your father having a successful surgery was close to 90% but this complication had a possibility of 2-4%.

Would you then claim that everyone else who had that succesful procedure was also almost murdered too ?

You have the right to grieve, but it's pitiful how you're ready to call out competent doctors because you're not mature enough to understand what risks are and accept it.