In short not only is a collision bad but it could create a chain reaction leading to billions of small objects flying around in the orbit forming a impenetrable barrier that bars further space travel and more importantly putting other (actually useful) satellites at risk
All of SpaceX's satellites are in low Earth orbit, and will deorbit themselves over time even if they die. Kessler syndrome is bad but overblown, and far more likely to occur due to antisat missiles from nation states.
There is an increased risk of collision, but the increase is marginal at best.
The probability of cascade-crash space-junk barrier is crazy small? Right?
For the lowest orbits, worst case scenario is just waiting 2-5 years for it to clear itself up.
So I'm not sure you could really even trigger Kessler syndrome there & it would likely be quite easy to avoid that debris belt if you did.
Yes