Your logical argument hinges on intent, which exists only in the mind of the perpetrator; no one else can be sure. In my opinion, the question of 'What is the likely outcome of an action?' as seen by a reasonable observer is more relevant. Evidence for the latter is much clearer than for the former.
Firing a gun towards someone does not inevitably kill or seriously injure the victim. The motive may be only to frighten and miss deliberately , they may be a poor shot and miss, or they may hit but inflict injuries that are not life threatening. However, a reasonable person may say that there is a possibility that that action will result in death.
Similarly (and hypothetically - I don't know the exact circumstances of the thread subject), a reasonable person may say that there's a possibility that driving a large, heavy car under the influence of drugs at very high speed in an urban area may also result in death.
So, in both cases, regardless of intent, a reasonable view is that each has a likelihood of harm as an outcome. In the second case, you say that very very few people driving dangerously intend to harm someone; again, aside from the fact that only the perpetrator knows their own intent, as I said above, isn't it the case that a reasonable person would think that would be a possible outcome? In the first case, how is someone's intention to seriously injure or kill quite clear to you? Is it not possible that the intention of someone firing a gun at, for example, retreating intruders is only intending to frighten them? The outcome of injury or death might be a strong possibility to a reasonable person, but no more so than the other case.
It's also a puzzle to me how views toward people who cause harm are condemnatory unless the medium used is a road vehicle, in which case it's always very conciliatory...