The only attack that was a random one was the one Over Cryme Time and the Harts, all the others had its motive, including the one over John Cena.
Liek everyone has pointed out, He chokeslammed Punk because he wanted the title, nothing personal againts Punk, but the title was the main thing, Storyline wise, Have H Hardy won, he would have got chokeslammed.
On the Tombstone to John Cena, Taker had the match and was ready to finish it, John Tagging in as he did was completely out of line and that is why He got the Tombstone.
On The attack on Edge, well this came at a time were everyone was pointing at Taker's head, and just the week before Edge teased to spear him and mocked him at the end, so Taker faced Jericho and when Taker threw Jericho over the announcer's table Edge got mad and started yelling at him, so hi got himself a boot to the face because he was looking for one, Taker is none step stone. Beside Edge speared him later on so he got his retribution.
On Chokeslamming Michaels and Rey, sorry but both guys kept disrespecting the Undertaker with Michaels always disrespecting the Undertaker because he thinks he can beat him (Can he? we don't know until March 28th) adn it has been the saem since last year, he mocks Taker all the time, that is not being cocky, that is been arrogant to a guy who has as many years as he on the business. In the case of Rey he kept saying he was going to beat Taker, so that double chokeslam was again to prove a point: Taker is none Step stone.
The attack on Cryme time and the Harts was because he was mad as Hell becasue on Monday night eventhough Taker has accepted all of Shawn's conditions now for some extrange reason Michaels is playing games again saying Taker is afraid of him because he was close to beat him, it seems that even the Undertaker won last year it is not enough to get the respect of Shawn Michaels and all taker gets is being Mocked over anda over again, that could piss off anyone, so yeah for those four kids it was the wrong place at the wrong time.
also, I have seen HHH attack people at random before and it has not being bad all the time.
Also before Austin start doing heelish things, Taker has always being a character with both characteristics, so he doing things like this notthing really new, he has done even before Austin got in WWF.