Throw, especially a “high-arch” throw like sasae, is considered a very aggressive technique in line with punches and kicks, at least where I come from.
If performed with skill, i.e. by a martial artist, they get more scrutinized and can be judged as excessive force in case of serious injuries. It goes the same for both police officers and ordinary citizens.
Remember that judo’s basic throws are designed to minimize the possibility of injury by allowing for a breakfall plus for uke’s own controlling action. Your version is actually what sasae is meant to be used in real encounter because it ends with slamming the opponent against the ground, flat. That’s pure todome. Back in feudal Japan it was both effective and acceptable. Today, I wouldn’t bet on the latter.
Going to the ground does happen, no doubt about it. However, it should happen when you can’t keep your balance either to break away from the opponent by throwing him over (e.g. tome nage) or getting back on top of him and then break away. In your demo you’re clearly not out of balance before performing tani otoshi. It may be a good move when arresting a fugitive, but that’s police arresting tactics, not self-defense.
I was once training with an American and a German police officers. The German, rest his soul, showed some painful throws under join lock followed by a boot to my head after I landed (luckily only simulated). He said it was a standard technique they used. The American guy, also a police officer with years of experience, only rolled his eyes