A little example of what I am saying, going back to self defence, is given by one of my students: I am aware to be statistically poor being it a sample of one but I like to mention it anyway. A.M. is a 5’7” (170cm) tall, 65Kg, 37 years old male, who was attacked by 3 large guys, in their early twenties and all over 6’ (180cm) tall: there was no reason for the attack if not the simply “let’s have a go at a smaller guy”. Relying on his striking skills he shove one away, punch another one to the throat and another one to the nose, breaking it. The attackers run away. I am assuming a judoka would have been beaten up.

It seems like you don’t account for the Judoka’s ability to do things differently outside of a pure Judo competition or training environment. Sure, most of the throwing techniques rely heavily on the Gi, but anybody with a solid base in Judo can apply these techniques with modified grips for a no-gi environment; Judoka don’t have a hard time transitioning into wrestling. Furthermore, many Judo throws can be modified to some degree to be more dangerous (dropping an opponent on their head instead of the back, for example). I’d also like to point out that, in light of you mentioning “the street”, few things are more dangerous than being forcibly thrown onto concrete.

Finally, the ground aspect of Judo, which is very similar to basic Brazillian Jiu Jitsu (the latter having been developed largely from the former), entails choking and joint-lock techniques. These are fight-enders. Somebody cannot continue to competently attack you after you dislocate their shoulder, snap their elbow, or especially after you choke them unconscious =).

While it is true that Judo is a grappling-only style, I would argue that the low cost, high availability, and full-contact training environment of Judo make it one of the best martial arts to train for the hypothetical self-defense situation.