Well you can check the software and check the signature on it to make sure it's coming from the right people and it has not been tampered with.
Do it for every download of any wallet software.
The most of the Users or people that using that Wallet i guess even dont know how to doing that you cant expect that everybody has that knowledge we have.
As mentioned already from _act_ there are a lot or many Apps and Software that dont have that feat. for checking this.
Best way is to make your one research a few times before you download or install something new on your phone or PC that you dont know.