., Police Code § 3304Actual or perceived race, color, ancestry, national origin, place of birth, sex, age, religion, creed, disability, sexual orientation, gender identity, source of income, weight, or height S.F.

I'd rather live beside someone like my husband then a sexual predator! 

In Redding, CA the drug addicts shooting up heroin in the parks was so bad rather than arrest them, they removed the playground equipment, and the public libraries in many towns are overrun with sexual predators using the computers.

Aside from engaging in assault, sexual assualt, or openingly engaging in some illegal activities.

However when one states that folks with a record of a violent or sexual nature its pretty easy to say that is protecting people. 

Landlords that are blatantly violating the law (slumlords, sexual harassment, violence, etc.). 

This is the DE wording in 4603(b)(3), the Delaware Fair Housing Act: (3) To make, print or publish, or cause to be made, printed or published any notice, statement or advertisement, with respect to the sale or rental of a dwelling that indicates any preference, limitation or discrimination based on race, color, national origin, religion, creed, sex, marital status, familial status, source of income, age, sexual orientation, gender identity or disability, or an intention to make any such preference, limitation or discrimination.

The only ones you read about in the paper are (a) Landlords that blatantly violate the law, or (b) Landlords physically assaulting or sexually harassing their Tenants.The best protection: know and obey the laws, treat your tenants honestly and fairly, and document everything.