I believe if everyone who was against the current oligarchy started placing guillotine stickers everywhere, like you might for a favorite band, people would feel less isolated in their distaste for the current system.
And in an ideal world those who the guillotines are for might realize just how much they are in the minority.
Violence is committed against the public everyday. Stripping the public of healthcare is violence. Stagnating wages are violence. Decreasing Affordability is violence. The For-Profit prison system is violence. The stripping of environmental protections is violence. The stripping of food safety regulations is violence. The shooting of protestors is violence. The beating of protestors is violence. The use of chemical warfare against the public is violence. The installation of spy cameras to limit free movement is violence.
Violence is fine as long as it is committed by the state to enforce the status quo and further the interests of the elite.