This was thoroughly unfortunate in all respects. We have a responsibility to conduct target practice in a safe manner, and hitting the window on another home is pretty convincing proof that the Iraq War veteran had not given enough thought to safety or to good manners. Homeland Security agents should have at least a little common sense, and calling in the world over a pellet ricochet is an irrational overreaction. As for SWAT, they were just doing what they always do, except that apparently no dogs were shot. I just hope this series of unfortunate events will not lead to yet another inconvenient and useless law.
Probably because none were around.
We don't know if it was a ricochet, and if the window was broken he may not have known it was a pellet. Some of the better air rifles can shoot a pellet at over 1000 fps.
I found a link to Texas law regards air rifles.
Like most such laws the focus is on safety and projectiles crossing property lines, etc.
http://www.capitol.state.tx.us/tlodocs/83R/billtext/pdf/SB01400I.pdf#navpanes=0