The inability of humans to be reliable?

The inability of humans to be reliable?

Here I'd like to question a human's reliability. Can a human prove his worth to others that he is reliable? It is as possible as proving his worth to his own self, which is basically impossible. Millions of factors can be listed on why nothing is reliable. External, internal implications, scenario situational cases, psychological states and mentality, biological breakdowns and evolutionary paths, backgrounds and history, all of these are just a few that compromises a person to be reliable at all.

A person ultimately, to a self-view, can trust himself, if we ignore biological and psychological states of that person, and it is easy enough for him to turn against anyone. Relying on this "freewill" mentality that people have debated for years whether such a thing is true or are we just following a biologically randomized protocol, means that even if we were to show loyalty of say, a 10 year friendship, or promises, or vows, or silent agreements, we still have the "freewill" of following honour and code or simply just breaking it.

Even if a person has managed to formulate a process in which to prove himself reliable, humans are such that they can put on an act, a fake, a front, and throw all that mattered aside just for a simple idealistic goal such as power or fame. humans are such, that they can act in any manner they like, and it is impossible to guarantee that anyone will follow rules or regulations or promises or loyalty, simply because we are humans and we have the option, no matter what the situation, of breaking the bond.

Whoever we are with or have a bond with, no matter how many promises are made or guarantees, nothing stops one from this "freewill" to pick that option which goes against what both have created, their own bond and relationship. Friends are never quite eternal, they fade and come back time to time, and strings that have been snapped are easily tied, only to be snapped in another place soon enough.

if humans have the ability to not be reliable, why make friends at all? why have contact with people? this is the simple reason. that slim chance for a person to change himself completely and devastate ties in an instance for their personal goals is the same amount of chance that you'd find someone out there who won't ever occur that slim chance.

basically, anyone can turn against or isolate themselves from you, but so can anyone be that special friend who will never be the anyone formerly mentioned.