I am glad that, in the real world, I don't need to deal with determined perversity among the people with whom I play games.
What are you going on about, mate?
If someone's idea of fun is to act in bad faith after voluntarily agreeing to the terms of an undertaking...
There's no 'bad faith' here. I really have no idea where you get that from. I'm saying all of 2 uncontroversial things:
1) If you're players aren't good tacticians, or they prefer playing rash, imprudent characters, lower the difficultly of your opponents accordingly. Step down your game. This is a lot easier than asking
them to step up their games. For that to work, you need their consent and help. As DM, you can lower the combat difficulty all by yourself.
Note my advice is often deeply rooted in practicality.
I don't see the need for a DM to run combat to the best of their abilities, if that's proving to be too much challenge. I DM to entertain my friends (and myself). I have precious little desire to "teach" them how to play the game. I use however much "force" is required to challenge them. I get the level wrong from time to time, sometimes spectacularly, but as Kurt Vonnegut says, so it goes.
2) Since the players don't seem to like challenging, tactical combat, find out the ways they
do like to be challenged, and put more of that in your campaign. For instance, perhaps they enjoy solving puzzles and riddles.
I agree the
game of D&D needs to be challenging. But a campaign can feature easy combats, which cater to tactically disinclined players, and still offer the players robust challenges in other areas.
Mallus, I really think you're just arguing for the sake of arguing.
I admit that's always a possibility... but I don't think that's fair in this case.