No, not all other countries, but all other first world countries. Yes, other tools are used. And they're less lethal. Just look at the charts above. If you can find other data present it.All other countries haven't figured it out.
Other tools are also used to attack people.
There are already laws against shooting people, and regulating gun ownership, and even where guns are allowed.
The Austin shooter was not legally allowed to buy or carry a handgun in Texas. There's a law against that.
He was not legally permitted to have a firearm on school property. There's a law against that.