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https://en.wikipedia.org/wiki/2016_Batley_and_Spen_by-election
It lets people know violence cannot change the balance of power.
Everywhere should do this. If you're able to kill a politician and it triggers an election for anyone, then you're just sort of implying that political terrorism works. At least to an extent. The violence was able to indeed effect change because some loner or a group of lunatics is able to kill someone and stop the line of work of the party they disagree with. Now, that may not affect votes themselves in a byelection but still. It's not a message you want to send.
Edit: Oop sorry OP. Only just saw the text you had on the post. I'm just whole ass repeating you.
Edit 2: From the wikipedia.... Conservativism as a political moviement is a blight on humanity.
On 18 June 2016, Liberty GB announced that Jack Buckby, a former BNP politician, would be its candidate in the by-election.[14] Liberty GB registered the description "No to terrorism, yes to Britain", which appeared on the ballot paper instead of the party name.