First of all, there will always be a point where ability is weight out by the number of opponents you face. This is called disparity of force. One expert can't outgun 20 amateurs with roughly the same equipment. This is exactly why we have and to some extent trust a police force; there can be more cops than bad guys, and they may just happen to have the equipment and training to deal with such a problem in a timely fashion (but the "may" in that sentence is why some people like us choose to take personal responsibility for our lives and carry).
It doesn't even have to be SWAT. If you have one man armed to the teeth, perhaps even armored significantly, enough patrolmen with sidearms and the occasional longarm can make a difference, if not stop the perpetrator. Citing North Hollywood, though I hate to do so, Phillips was a juggernaut, but was eventually brought to the point of suicide by the sheer volume of police firing on him with relatively ineffective weapons.
Furthermore, competition shooting is not tactical shooting, and if your aim is to kill people effectively in a short time, skill in competitive environments is just one variable in a more grand equation, and would not necessarily translate into a combat or even a mass shooter scenario. In combat, there are so many other things to consider besides marksmanship or speed.
The real kicker isn't one or two competition shooters starting something, it's a relatively strong and cohesive fighting force with knowledge, strength and courage to actually cause a long string of damage and effectively defend themselves from police. Thankfully you need to be ex-military, as well as contain a large amount of stupidity or sociopathy to be that effective and apathetic towards others, which is why we don't see this too often. You have stupid ex-mil guys who aren't sociopathic, you have stupid ex-mil guys who are, you see moderately intelligent ex-mil who still aren't smart or strong willed enough to apply their skills toward such goals for whatever reason (no desire to commit crime or kill, whatever). And then you need many of these intelligent, sociopathic ex-mil men to join forces, and they just don't exist or co-exist. We appreciate enigmatic serial killers and criminal masterminds in the movies for the same reason we like mysticism and unicorns; they don't really exist.
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