If we are to take full responsibility for all of our choices and actions then that means that the things that we do stand alone, in and of themselves.
It doesn't matter who did what or what was happening around us, in the moment. When we are truly responsible and accountable, we do not look to others actions or choices as an excuse to justify our own.
To accept Personal Responsibility is to take Accountability for our own Choices, first and foremost.
Don't expect your neighbor to pick his dogs **** up off your lawn when you are knee deep in the horse manure you just dumped in his front yard.