I don't think it's fair to blame individual developers for a systemic failure. Its not their fault there is no governing body to award or remove the title of "software engineer" and promote the concept of a software engineer refusing to do something without harming their career. Other engineering disciplines have laws, lobbied for by their governing body, that protect the ability of individual engineers to prevent higher-ups from making grave mistakes.

I have worked in this industry for 20 years and never met a piece of software I would deem "safe". It's all duct tape and spit. All of it.

I have had software professionally audited by third parties more than a few times, and they basically only ever catch surface level bugs. Recently, the same we the audit finished we independently found a pretty obvious sql injection flaw.

I think the danger is not in producing unsafe software. The real danger is in thinking it can ever can be safe. It cannot be, and anyone who tells you otherwise is a snake oil salesman.

If your life depends on software, you are one bit flip from death.