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We can know nothing for certain

The word triangle and the definition of a triangle mean the same thing. You've defined it using itself. This only shows that you think. It shows that you have a logic syntax: that things can "is" or that things can "not is". Are there triangles, or are you a long file directory? A pyramid of rules?
3 supporter.

We can know nothing for certain

Build machines to detect light intensity, relative particle excitement, and wavelengths of light. Do they have subjective experiences too, or do they agree with our senses? If machines dont actually sense reality, then reality is out of our reach. Only question left is if your thoughts really exist.
1 supporter.

You should not prevent someone from commiting suicide.

But people have been shown to consistently underestimate how much they are going to change in the future. The decision is being made for a person that is technically different from the current one. Deciding to kill someone who is not 100% you is by definition murder, not suicide.
1 supporter.
1 fallacy report.
Appeal To Belief