Beware of homeless vagrants detracting from your experience. If a fight were to break out, it will most likely happen near the television. To be cautious, I would recommend a seat by the exit and leaving all your personal belongings on you (i.e. dining with your coats/jackets on and purse across your shoulder).
This is allowed to happen as our stellar police officers will not remove anyone (regardless if they over stayed the posted maximum time to use the dining room) until they have actually, killed or hurt someone or became belligerent and embarked on a rampage by destroying property.
Otherwise, you're on your own; unless you have a bodyguard protecting you.