Anyone who chooses to grab their phone while driving a car deserves all the negativity they get. Unlearn that habit. Seek help if you're addicted to that device. Or just take the Tube.
If not, the driver is still in the wrong.
More importantly, laws are written under the tacit assumption that they won't be perfectly enforced. Have you ever driven 31 mph in a 30 mph zone? Illegal! You're in the wrong!
I have never watched his videos so I don't know what proportion of his videos are of people stopped at lights briefly looking at their phone... but I don't think many people (even cyclists) would seriously object to that.
I both cycle and drive a lot. There are a lot of bad drivers that I wish would get snitched. But I also occasionally look at my phone while waiting at a red light.
“a member of a volunteer committee organized to suppress and punish crime summarily (as when the processes of law are viewed as inadequate)”
That’s from Miriam Webster. I’d say he isn’t punishing crime, I could see an argument that he’s suppressing it, but it doesn’t really fit my normal view of the word.
The guy is quite literally taking the law into his own hands and it's very clear that running around trying to cause car accidents is making people less safe, not more. In many cases the "accident" he claims to want to prevent is caused by his actions.