Why do people online make death threats against liberals but not in real life?

online I have had my life threatened so many times for being democrat and liberal and yet these same trolls who issue death threats probably don't say them out loud in real life. I wonder would conservatives be so bold if liberals were to give them the same visceral hatred and death threats they give to liberals on a daily basis.

Why do people online make death threats against liberals but not in real life?
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