The app stores do not offer any kind of information that would help to put my trust in the developer and application.
Certifactes are a fallacy that tell nothing about the security of the app. They just tell that the app was signed someone that has a security certificate.
Also why do all security experts want to shove their security agenda to the world ? If you are dealing with life or death matter than it is probably better not to expose your world to the wild. For everything else it is OK to live without the safety net, it is OK if someone looses some money or your mum's disk gets encrypted. People fall every day and I sencerly hope that there will not be some police that will force you to wear a helmet ass soon as you get out of the bed.