I find alot of Muay Thai techniques are perfect for putting down an attacker quickly. Just a well placed Thai kick to the thigh will floor most people and one can assume that the attacker will not even know how to check it properly. Their first reaction may be to block it with their hand...which would inevitably end with their wrists broken.
It doesn't end their. The clinch, like before mentioned, is extremely powerful. If you've watched some of Shogun's or Wanderlei's fights where they get their opponent into a Thai clinch, you'll see they have little to no trouble keeping control over them. If a professional fighter has trouble getting out of it, imagine your typical street thug trying to escape that. It would seem impossible for him. Nail him with knees, walk away...end of story.
Close quarters. Here the knees and elbows get dessert. Knees into the groin, thighs, ribs, solar plexus. Elbows to the temples, eyebrows, nose, chin, mouth. These are all potential fight enders.
So to answer your question: Yes.