Two things:
0) Humans (and even our recent ancestors) eating you are a very recent thing to be concerned about, numbers-wise. By the time our numbers were enough to provide evolutionary pressure, we started farming what we wanted, which kinda breaks the process. Also. most poisons don't effect everything equally, so what might prevent a horse from eating you might taste delicious to us (like the nightshade family) or even be sought after for other reasons, like capsaicin.
1) You're succumbing to the usual evolution fallacy. Evolution doesn't want anything more than 1 and 1 want to be 2. It's just a process, and sometimes (hell maybe even often) it doesn't work in a linear fashion. Lots of "X steps back, Y steps forward", and oftentimes each of those steps can take anything from decades to centuries or more to make, and by the time it happens what was pressuring that change is gone.
So many people, even when they obviously know better, like to think of evolution as intelligent. It's obviously not. But every time someone says stuff like this, it reinforces the fallacy and then we get people saying things like "if evolution is real, why come $insane_argument_against_evolution?"
0) Humans (and even our recent ancestors) eating you are a very recent thing to be concerned about, numbers-wise. By the time our numbers were enough to provide evolutionary pressure, we started farming what we wanted, which kinda breaks the process. Also. most poisons don't effect everything equally, so what might prevent a horse from eating you might taste delicious to us (like the nightshade family) or even be sought after for other reasons, like capsaicin.
1) You're succumbing to the usual evolution fallacy. Evolution doesn't want anything more than 1 and 1 want to be 2. It's just a process, and sometimes (hell maybe even often) it doesn't work in a linear fashion. Lots of "X steps back, Y steps forward", and oftentimes each of those steps can take anything from decades to centuries or more to make, and by the time it happens what was pressuring that change is gone.
So many people, even when they obviously know better, like to think of evolution as intelligent. It's obviously not. But every time someone says stuff like this, it reinforces the fallacy and then we get people saying things like "if evolution is real, why come $insane_argument_against_evolution?"