Agreed. Here is a friend's chihuahua we watched for a few months 'attacking' my 130 lb Leonberger
OMG - looks like it's too late for your big fellow. Little guy has him down and big guy has given up! Very sorry.....
On more serious side, it is sad that we have so many dog owners than don't understand (or maybe care) how irritating or in some cases dangerous our animals can be to others.
I have fostered for an extended time or personally owned around 25-30 dogs. Almost all were medium to large size dogs (great dane, boxer, couple German shepherds, Rhodesian ridgeback, several pits, couple labs, and several mixed breeds). Several of them came "damaged" in one way or another (ex: fearful, aggressive, lifeless, sick) from bad circumstances or owners. Most had little to no training that I could tell. I've been very impressed with how every one eventually came around due to training, good exercise and love to become good pets.
So one person's experience is that the vast majority of dogs can be good pets if their owners take the time to actually care for them and train them. I wish all owners would take that time. Beyond that, we as owners need to respect that many people simply do not like and may be afraid of our dogs, no matter how well trained or docile they might be. Our leash laws are intended to help address that issue and still provide dog lovers the ability to have their pets.
In many towns, we have dog parks to allow them to run free and socialize. We also have tools like bike tow leashes to allow us to exercise them by running them until they are tired. There is really no excuse for us as responsible dog owners to have our dogs charge others .... or for that matter, even just bug others that don't want them around. So I encourage all of us to address irresponsible owners if we run into them. I certainly do and hope others will as well.
BTW - you might wonder how often someone like me has been bitten given that I have picked up so many dogs with problems. Probably no surprise that I've been bitten a few times over the years. The surprise to only some might be that I've only been bitten by my own dogs twice in 50+ years - Once got bit by a Husky during a break up of a fight between two of my large dogs (he was trying to bite the other dog right when I put a hand over his muzzle). The other time was a brand new sheppard mix we just picked up that was extremely fearful of men. Actually could have avoided that bite but didn't really care too much (fairly small dog -- 45 lbs?-- and needed to establish control and leadership quickly. What may be more of a surprise is that I've been bitten a couple times by other's dogs.....but only small, hyper dogs. Can't read them very well so have gotten nipped several times when owners said they were friendly so I could pet them. Larger dogs I find much easier to read, never have problems with them. Just one person's experience and why I mentioned a small dog (a bit tongue in cheek) in my earlier post mentioning problem breeds.