Why must all modern technology create radio interference?

I prefer to listen to a weak AM radio station for their unique content. It continues to become more difficult due to noise from sources of noise that shouldn't make ANY RF noise at all.
Things like crosswalk signal that make farting noises as the "don't walk" light flashes. Totally obliterates radio for 50 feet. Cars alongside me where the spark plug noise is not suppressed, another 50 feet of interference.
I would have been flunked out of engineering school if any of my designs were so stupid as to make radio interference.
Our FCC is a joke, and if you think this is only an issue for AM radio, you are mistaken, all services that use RF are beginning to suffer from the pollition.
From cable boxes to DSL phone internet, switching power supplies, lamp dimmers, switching mode power amplifiers, DC motor drive controllers, smart meter data transmitters, all these do not follow good engineering practice, and would never have passed FCC part 15 rules in the 1960s, because they are polluting to all wireless services.
Back in the day, some idiots would put solid copper wire spark plug wires on their vehicles and destroy police/ambulance communications for miles. They also got tickets for this when they were caught, which was easily accomplished.

It's like saying a little bit of shit in food doesn't hurt anything, so let's not expect anyone to worry about washing their hands anymore.

I don't expect anything except for it to keep getting worse.
I've had new rental cars that make so much of their own noise that it's impossible to listen to the AM radio AT ALL except with the key in the accessory position.
As an engineer, this enrages me.
A small natural gas leak is NOT OK, a little bit of shit in food is NOT OK, neither is willfully created radio interference.