coincidentally, the only traveling incident ive had was my friend, with whom i was traveling, getting pickpocketed in st petersburg. he also had stupendously poor situational awareness.
the things that you mentioned is not anywhere as rife in prague as it is in pockets of barcelona, paris, etc. basically, the highly touristed parts of europe.
prague is not not absolutely standout for any of those things. doesnt mean you shouldnt keep your wits about you.