(*) I apologize to all canadians workings in the baby seal killer industry for associating them with pointer holders
now thats funny. 
i carry a pointer with me, and its kept tucked away inside where my intergrated weight pouch fits. it connected to a retractable lanyard and used firstly for clanging my tank if i need to get mrs stew smiths attention. i have used it a couple of times perhaps to point at things that other dive friends with me cannot see, as they are not as experienced and their knowledge of critters is minimal. i did try using a finger to point at things but they didnt have a clue what i was pointing at. the pointer helped in these instances. i have also used it to gently open up a feather star. to look whats inside. i consider myself to have done this without causing any harm to the feather star nor the shrimp/crab inside. if i thought that i did cause harm then i would not do it. ( sorry for being honest )
as for guides using them, well i did bring this up in the DD discussion and say that if you dont like creatures being touched dont go to lembeh as you will be paying into this. ( or words to those effects ) as all the guides use them to "encourage" the critters out into the open.
as for hooks. mrs smith and i own one. we dont use them often, probably only used it a couple of times as well. but when we are diving in area like, galapagos,cocos,komodo,maldives we feel they they are essential pieces of gear to have just in case they are needed. maldivian channel diving is sometimes hard work and out there for some reason the guides love to fight the current.
sadly i have witnessed the mis use of these tools. i have seen divers head towards the reef and stick their pointer out to make contact with what they thought was rock ( well i hope they thought it was ) only to find it sinking straight in as what they had done, was to stick it straight into sponge.
tools are great pieces of equipment, just like cars. in the wrong hands they can be deadly.