i wouldn't trust my life on it that is for sure. your life worht less than a couple hundred bucks ?
That is the standard answer that we usually hear when discussing worn tires or old tires or plugged tires. Unfortunately, I don't think it is as simple as this. This statement considers the severity of the risk but fails to consider probability of the risk. If a tire goes bad quickly (proverbial blow-out) while riding at high speeds, I agree that the consequences are likely to be very bad. I doubt too many people disagree with this. Where people are more likely to disagree is the probability of a patched/plugged tire leading to a blow-out. I consider the chance of this to be VERY low. Lower, for example, than being involved in a high speed accident in my car. Given this assignment of probability that I ascribe to, it would make more sense for me to avoid driving my car than driving on a plugged/patched tire.
What is missing from this entire argument is a true impartial, scientific, and accurate assessment of the probability of a blow-out when riding on a patched/plugged motorcycle tire. I don't have this data and no one else has offered this data. At best, I and others are offering or basing our opinion on our own experiences which are simply anecdotes. One of my favorite expressions is that "Proof is not the plural of anecdote." and this certainly applies here. I have no proof/data that the probability of blow-out is low and you have no proof/data that the probability is high.
Do you or anyone else have any actual data on the probability of plugged/patched bike tires suffering from a blow-out? I sure don't, unfortunately.
My discussion above certainly does not resolve anything. All it really does is transfer the discussion from how "risky" it is to ride on a plugged/patched tire to the more correct - what is the probability of having a blow-out on the same tire.
But to answer your question, I believe that the probability of blow-out is far less than plenty other risky activities in which I choose to engage - including simply riding a motorcycle to begin with. You believe the probability of blowout is high and hence will not ride on a patched/plugged tire. I don't agree with your assessment of the probability but I defend your right to have this opinion. Your bike, your life, your choices.