It is. You may do almost anything with your property.
It just happens that renting out is one of the things regulated because of demonstrated negative externalities.
> It's like a subtler version of guilty-until-proven-innocent.
That principle only applies to criminal law.
> That principle only applies to criminal law.
Of course you're right, literally. But only literally. Which part of the word "like" do you not understand?
Is it perfectly fine to treat people with a G-U-P-I attitude as long as you don't do it in the context of criminal law? What about Google canceling your Adsense account for reasons known only to them and refusing to talk with you at all? What about PayPal freezing random charities' accounts with no recourse other than shaming them on reddit? If that's okay, may I accuse you of killing my cat, just because you can't show me any proof that you didn't?
Generally I would argue that businesses that provide contracts to the wide world would have termination clauses : both parties can end the contract, with no warning, with no explanation necessary. Since you agreed to this, why would you be opposed to it ? Go to a competitor.
Killing animals you don't own is entirely different (it is criminal) and I don't understand why you're comparing the two, or why you feel both should carry similar laws.