Me and my naysaying

I was trying to think about why I always end up getting to this point in a job where I become kinda jaded. Starting out, I like the job okay - it's fresh, it's new, it's not so bad. I do fairly well and am given more responsibilites and knowledge of goings-on in the company. Then a fatal flaw occurs: I start to care. Care about the business, care about the clients that it affects, care about the image and reputation we're putting out there and want to make it better. It would be easier to just shutup and do my job without giving it an extra thought, but I can't seem to help it. I make some suggestions, do some of my gentle naysaying and usually at least some of it is received well. Then again at times it can come across as being nitpicky and negative and concerning myself with things that aren't my concern. Whether it's said or not, it is usually not my place to take these things upon myself, so I stop. These are usually matters that either aren't cost-effective or part of the Bigger Picture, therefore not worth the concern with the higher-ups. More often than not, I am reminded that the business world can be ugly and sometimes in these cases ignorance is bliss. I'm not to be mistaken as a go-getter, perhaps I just would like to think my criticism and attention to minute details occasionally work towards a good cause. I guess for once I should do what most people do and try to find a job that's worth caring about!