"They are not dumb" - and neither are most of the employees of nearly every other company that does unethical things. That's not an argument.

"By the past they have proven numerous time that they have a lot the sense of responsibilities -- as employees, as a whole." - arguable, but even if true companies and their cultures change. You cannot trust a company, especially a public one, as you can a human.

Ideally I would rather the amount I have to "trust" companies be reduced wherever possible and that's only achievable via regulations and enforcement of those regulations.