I'd submit that a cable television station is more easily avoided than a public square. In the case of cable television, people actually buy the service. So, if someone doesn't want the product they simply choose not to buy it. After careful examination of multiple offers for cable television, I myself have chosen not to purchase the service. The $300+ a year I save buys many, many magazines, books and other media of the type that I prefer.
Well, you must not have children. I teach religion; most kids are from homes with cable, but even if only 20% of the kids on a team, on the bus, in girl scouts/boy scouts, or in class in public or private schools are being indoctrinated with garbage, believe me, everybody is. Just like if the small farm town carny show had had some freak or a live sex show, believe me every kid in town would know about it. Television cable or otherwise is the New Town Square, the New Public Square and it is getting very perverse to the point that those allowing and excepting it are now ready to assign rights of marriage to just about anything: could be two guys; could be two gals; could be four guys and a gal... the question is if it's just a choice and anything goes, well then anything goes. That is not the name of the game in civilized society, not everything goes. Don't think you're selling out libertarianism just because you embrace the notion that not everything goes. The word for that is anarchy. V's wife.