That still didn't answer my question. In fact, it avoids it. Obviously, my question scared you and hurt your feelings. Awe, I'm sorry. Do you need a hug?
Sure it does.
(And I'm assuming that you don't use any proprietary closed source software like Windows, because, you know, people can't look the code for malware...)
And why people say "it's open source it's safe" and you keep asking for authority that verified the code, and the aforementioned answer is a good one, specially with bitcoin, because there are lots of projects based on bitcoin, like litecoin, namecoin, ppcoin, terracoin, and many others, this is pretty usual with popular free open source software.
You do realize that for someone to alter bitcoin they have to look the code, and keep looking, if they don't wanna go a completely different way...
And there are lots of altcoins out there, so, lots of people looking...