Our tastes mostly come from our distant ancestors. Some of them are clearly harmful in the modern world, e.g. people eating too much delicious sugar leading to obesity, diabetes, etc.

Just as we evolved to mostly eat cooked meat rather than raw meat, we can also evolve to stop eating killed meat altogether.. A more environmentally sustainable & compassionate world is critically important for our future well-being (and possibly survival).

Some of the most poisonous fungi are very tasty. Does it mean we should switch to eating them?

It is said, and I don't care to find out if this is correct, that those who have tasted human flesh say it is similar to pork.

Humans definitely aren't meant to eat human flesh, regardless of the taste, thus your argument is invalid.