In as much as one believes in the existence of Bitcoin and as a coin worth investing prioritizing profits maximization over time without considering that things could go side ways can also be bad, irrespective of the fact that every business or investment is built on profits maximization, there can be loss too, tomorrow they said is pregnant and filled with uncertainty being ready to accept that there can be loss too and even considering what the worst situation could be not just looking at the profit side of it.
Mate, every investment involves risk. That is why it is always good for you to carry out your research to know if the investment is worth the risk before you can invest your money. Also, don't invest what you cannot afford to lose so that if the investment goes sideways, it will not affect your life.
I really don't think job security is paramount here in things to consider before investing into Bitcoin, because in life anything can happen, even the job you feel that is secure, they might just lay you off for no just reason because life is unpredictable, and that is more of the reason why we should not play with our savings and emergency fund, because that is what going to keep you going till you get another job.
Job security is important to consider before starting your bitcoin investment because it will help you take care of your personal needs. If you think someone will be laid off from his job for no reason before that person starts his bitcoin accumulation journey, he or she should save a reserve fund that he or she will use in the future in case he or she loses his job that will help to settle his financial needs until he or she gets another job so that he or she will not depend on his bitcoin investment to settle his financial needs.