I'm usually not okay with people grabbing people, whether the people being grabbed are adults or children,

but I make an exception for genuine safety issues.

If

a) LW was genuinely concerned the kid was going to burn their hand tossing the rubbish in; or

b) the rubbish was extremely flammable, like an aerosol can; or

c) the rubbish was something that releases highly toxic carcinogenic fumes, like plastic rubbish

then I am okay with the grabbing, especially after multiple attempts to stop the behaviour verbally.

But if the rubbish was something safe like paper tissues, paper, twigs, woodchips, marshmallows etc etc and LW didn't genuinely think there was a danger of the kid burning their hand, then I am not okay with the grabbing.