Question: How does ambition impact people?
Ambition, by definition, is the desire by personal achievement, which means it is able to motivate someone to accomplish many things. Ambition alone cannot have a positive or negative impact on someone, but it could cause the action on a negative desire, which would cause a negative impact.
Also, from another perspective, ambition itself could be perceived as evil because it is the desire for personal achievement. This tells me that ambition is an act of self indulgence without the consideration for other people's needs or desires.