If it prevents them from crushing my snacks, ditto.
Most of my interactions with the bag check security folks are quite positive. Some are busy focusing on being efficient and quick but serious about the work they were doing. Others like to make a bit of Disney magic themselves to the start of your day, so they comment on something fun I'm wearing or take an extra moment to look through my pin bag to see what I'm trading that day and wish me luck on whatever I'm trying to trade for.
And then, there's the rare person who's just being... yeah. Like the guy who wasn't looking in people's bags at first. He was groping them on the outside and then guessing/proclaiming what he felt the items inside were (aka showing off for the cute security girl standing next to him who was trying to smile but seemed equally unimpressed by him holding up the line that way), calling out "phone!" "wallet!" "keys!". When he got to my bag and started feeling the outside of it and smashing his hand down on top of things that were inside, I politely asked him to please be careful as I had some snacks I didn't want to get crushed by his squeezing (a bag of chips and a banana) and he turned to me in a fury and shouted "EVERYTHING OUT OF YOUR BAG NOW!" Somewhat taken aback, I removed the chips and banana and returned the bag to him wide open for his inspection. He shouted at me again "EVERYTHING! TAKE EVERYTHING OUT RIGHT NOW!" I was so confused by this aggressive behavior at my polite request and frankly shaken by his anger at me, that I took everything out of my bag and he proceeded to take extra time touching and squeezing and going through each and every item, including rifling through my wallet although even a simple visual inspection would have shown nothing of concern. How I felt about this treatment must have shown on my face to the security person ahead at the metal detector who asked what was wrong. In frustration, I just nodded my head behind me at the guy and said "that one". The security person gave me a sympathetic face and a nod of understanding as I made it through and away from there as quickly as possible. Immediately afterwards I was mad I hadn't gotten the guy's name to report him for harassing a guest and showing off for a girl instead of just doing his job, but I did not want to go near him again to return to ask for it.