They do have a safety. It’s a trigger safety, not a thumb safety. This means that you have to have your finger in the trigger and pull it for the gun to go off. If the trigger snags on clothes or the gun is dropped or whatever, the gun will not go off.
The glock is a striker-fired gun. That means the trigger pull to fire will always be the same. There is no double VS single action, which is probably what you’re thinking about when you say “light squeeze to fire” as a double action gun like a Beretta 92FS will have a noticeably shorter and much easier pull if it’s cocked VS uncocked. There is no “partially pulled back” with a glock. You always pull the trigger the same amount with the same force to fire. You cannot “decock” a glock.
Now how much force does it require? That is up to the trigger spring. Some jurisdictions like NY force glocks to have a really heavy trigger pull but as far as I am aware there is no data supporting that it makes them any safer.
I will say if I had to criticize the glock, it is that you need to pull the trigger to disassemble the weapon. Of course you should only be trying to disassemble it after you’ve cleared any rounds from the chamber but it is one minor flaw with the design and one reason why the glock wasn’t eligible to become the US Army’s sidearm.
Now how much force does it require? That is up to the trigger spring. Some jurisdictions like NY force glocks to have a really heavy trigger pull but as far as I am aware there is no data supporting that it makes them any safer. I will say if I had to criticize the glock, it is that you need to pull the trigger to disassemble the weapon. Of course you should only be trying to disassemble it after you’ve cleared any rounds from the chamber but it is one minor flaw with the design and one reason why the glock wasn’t eligible to become the US Army’s sidearm.