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From your POV and mine yes. From their POV no. Clearly that's why they did it.No. You're confusing what someone mistakenly believes with the quality of the idea.
In this case, the POV doesn't change that this was a bad idea. Someone can think at the time something was a good idea, but this doesn't make it so, especially if it was demonstrably a bad idea. Few cases are clearcut, but this was.
The Heaven's Gate cultists thought their souls would get uploaded, that's why they killed themselves. Their souls weren't uploaded; therefore by their own logic committing suicide turned out to be a bad idea. They just aren't here anymore to reconsider, which demonstrates it was worse than a bad idea: it was a terminally bad idea.
Another example that POV doesn't necessarily change the quality of an idea: a toddler finding and handling their parent's loaded gun is objectively a bad idea (as is the parents leaving loaded guns within reach of toddlers, if they did it on purpose out of carelessness). The toddler may not know, from their POV, that this is dangerous; but this doesn't make it a good idea.
Some ideas can change with the POV, but you're mistaken in believing every idea does.