Are you serious? Don't fill it out. Your inviting trouble if you. And the census violates our constitutional rights.
Amendment Four
The right of the people to be secure in their persons, houses, papers, and effects, against unreasonable searches and seizures, shall not be violated, and no Warrants shall issue, but upon probable cause, supported by Oath or affirmation, and particularly describing the place to be searched, and the persons or things to be seized.
This is a violation of unreasonable search - the citizens are not being secure in their persons, houses, papers, and effects.
Amendment 5
No person shall be held to answer for a capital, or otherwise infamous crime, unless on a presentment or indictment of a Grand Jury, except in cases arising in the land or naval forces, or in the Militia, when in actual service in time of War or public danger; nor shall any person be subject for the same offense to be twice put in jeopardy of life or limb; nor shall be compelled in any criminal case to be a witness against himself, nor be deprived of life, liberty, or property, without due process of law; nor shall private property be taken for public use, without just compensation.
For Amendment 5 the case can be made that by providing the government with personal information the citizenry is ceding this right to avoid compulsion of witness against themselves