The treatment may indeed work, but they aren't certain of that yet.
What if they let everyone get infected and then gave everyone treatment and it does work, or worse ends up increasing the number of dead because of side effects. Drugs aren't perfect, in some cases they cause worse issues than they treat. The need time to make sure it's effective and safe.
So immediate death is seen as better than death from sides effects years later, its OK man, in all honesty that's why people are dying and that's why I have my hydroxychloroquine and azithromyocin as i dont trust government as they think similar to yourself i bought both drugs on the net over a month maybe 6 weeks ago, there're also HIV drugs kamera thats are working, along with Ivermectin etc.
People are dying due to herd incompetence not herd immunity, they are still dying as worldwide supply has dried up as countries look to nationalise supplies, Governments have thought like you do, until the body count got up high enough. Now the position of managing from a position of potential liability which all western governments mange from has changed as some governments and countries have little to no mortality compared to others and the difference is treatment. So now all the high body count nations have to look at themselves and think how many must die before we change practice, they have changed now but cannot secure supply.
This virus and the treatment options cannot save the very old who were dying anyway, and you need to get the drugs into you if your old before you get to far gone, yes drugs are being rationed due to lack of doses, basically if your not old and sick which is the high risk group they dont want to give it to you and in a few cases this has caused death, as you need to get the treatment into you before you get to respirator stage in most cases.
No doubt it is bad but ask yourselves how did the world health community let so many die when there was already viral medication available thats just wasn't approved to treat a new virus, wouldn't you think you would check existing drugs, before looking to new.
The WHO is as incompetent as the UN.
Dont trust your government, we all have to to a point, but do what you can outside of that trust to save yourself and others, never underestimate the incompetence, no different to not owning a gun as the police have them to protect us. They can't be trusted with our health and this crisis demonstrates thats.