Everything bolded applies to me. (with added comments)
ISTP
ISTPs value privacy and sometimes keep important issues to themselves. Their concern for the present moment and their inability to recognize the importance of setting goals, often leads them into conflict with authority. Being action-oriented, ISTPs react against restrictions - which typically causes the controls placed on them to increase. In these situations, boredom can quickly set in and the ISTP may experience feelings of internal emptiness. Overly regulated situations cause ISTPs stress. In such situations, ISTPs either attempt to flee or turn to fight their adversary face-to-face.
I can see a lot of this in me. I don't like being told what to do, especially if I perceive the authority figures as being stupid, arrogant, or both. It might have a bit to do with my experiences in prison... or maybe not. I've never been especially enamored with authority. When I was in prison, I did break rules and, for the most part, got away with it. I don't know, though, if that is a reaction against the restrictions naturally involved in being in prison or an expression of me as a free spirit. I was sent to prison for protesting on a military base so I guess... more conflict with authority.
Yes, I suppose that I am very focused on the present moment. I can't perceive the future as being real. It's hard for me to conceive that unpleasantness, such as the overly regulated situation, could ever end. It's hard for me to gain any sort of perspective. So I tend to rebel against what I perceive to be stifling authority.
The ISTP's form of retaliation can be characterized as defiling what other people value. The ISTP violates rules and regulations that protect individual rights in retaliation for the lost opportunities and freedom that the ISTP believes they have had to endure. Getting even stimulates them and a renewed sense of excitement emerges from the risks of revenge and the expression of outrage. If stress continues, ISTPs will put what remaining freedom they have left in jeopardy by rebelling further.
Ok, well maybe the last sentence. I don't really believe that I feel stimulated by getting even or by taking revenge. I am somewhat rebellious and I am a free spirit but I don't think that I am motivated by the need for revenge.
ISFP
ISFPs can be over-accepting of others and need to be more skeptical at times. Their need to please everyone makes them reluctant to critique any one but themselves. This excessive desire to trust others makes them targets for hurt feelings and disadvantaged relationships. Long-range planning and adherence to policies can be their downfall. When the freedom to act on their instincts is limited, ISFPs become bored, restless, and passively defiant. They are skilled at seeming to comply with regulations while annoying those who cause them distress.
I can be rather excessively accepting of others, I suppose, although I've never really seen it that way. I also prefer to trust than not to trust. I will trust people unless they give me cause not to. And yes, people sometimes take advantage of my tendency to trust. I'm not sure about the bored and restless part and I have my doubts about "passively defiant." I think that, when I'm defiant, I pretty much say so. It's really not passive.
If stress continues to build, ISFPs will penalize others through self-degrading behavior. This behavior has the tendency to divert accountability away from themselves and onto others who they blame for their plight. This restores the excitement back into ISFP's lives while at the same time getting even with their accused oppressors. Rationalizing their responsibilities, stressed-out ISFPs attempt to find their way out of unstimulating circumstances through seeking inappropriate thrills.
I don't know if any of this applies.
ISTJ and ISFJ didn't seem to apply at all.
This is very interesting, looking at personality types by their negative traits. I still haven't decided between isfp and istp and, based on my responses above, I still don't have a clear choice. I'd like your feed back and to continue with this exploration.