If you had a friend that was doing something that you knew was really wrong and had the potential to harm him, wouldn't you try to help him by warning him of the impending dangers?
Kind of like pulling him back up on the curb if a bus is going to hit him!
If I was about to step on a rattlesnake I feel that you would try to warn me about it instead of trying to get someone else to think that it was a good idea to step on the snake!
I'm trying to warn you as a friend, if I didn't care about your safety enough for me to warn you about a very dangerous situation that has the potential for harm, I would have just moved on and forgot about you and your Rube Goldberg apparatus.
Comparing dangling strings and Velcro to a manufactured throttle lock is .....well you know!
Now that I know you don't care about your personal safety enough to take the wisdom of my 70 years of experience and seeing little things like yours become life changers for people I will just move on!
If you don't want my caring advise maybe someone else that thought your idea had merit will give it a little more thought than you did and let good sense prevail!