Do I trust it 100% ? No.
Would I trust a USAnian product to a greater degree? Also no.
And that's not intended as a political comment...
Trust is a very odd concept in computing as there is, essentially, very little (or even none).
Do you trust a piece of software like Internet Explorer not to siphon off your usernames/passwords to a third party? You can't see the source...
Do you trust a piece of software like Firefox because it's open source?
* There are plenty of examples of open source software that has had vulnerabilities in it for years despite having thousands of eyes looking at it and reviewing it (OpenSSL is one big can of worms in this respect).
Just because the source is considered safe by many people, how do you know the binary you've downloaded was compiled from that source? (Reproducible builds are gaining popularity but...)
If you compile the source yourself how do you know the compiler isn't tainted in order to inject the malicious code into things being build? (This applies to the compiler source itself.)
Apply all of the above to the Operating System too (it might not be executing the actual binary you've told it to, it might be using its own version with the malware embedded in it)...
After all of this, you've then got to consider the fact that the hardware you're using might be complicit:-
* internal management engines such as Intel ME
* CPUs, keyboards, USB hubs, network cards, etc that will siphon off important data or keystrokes
And then you've got to think about all of the networking equipment in-between you and the destination. There are so many possibilities...
