Lois, I agree with you, those 'hooigan' political sign stealers should be punished, along with all political sign stealers who enter on property not their own, to remove or distress signs posted by the property owner, for any election, ever.
If the Warning was the extent that responding Police could deliver, then so be it, and just wanted to say we agree about "Sign Stealers", regardless of the election, or politicians involved.
Finding a Trump Sign in the District Of Columbia is very rare, not only because DC will faithfully deliver it's total of 3 Electoral Votes, for the DEMOCRAT on the Ballot, dead or alive, lol... as DC has since gaining the vote in National Elections.
Even McGovern got our 3 Electoral votes when he ran.
Still, knowing those passing by my house, if not my neighbors, would find ways to deface, or remove any Trump sign, and perhaps deliver a additional defacing to my home, or car, or windows, there are no Trump Signs outside my home, or even in the windows.
Those days have long passed in my hometown, when one could show her support of any but a Democrat Politician expressed in Yard Signs, without expecting trespassing, violent treatment, by passers by... is it organized... IDK, just seems a pity, that it is "allowed", and "expected" in the Nation's Capital.
Will fly the American Flag above our Front Doorway on Election Day... and take our chances, I suppose.