Yes this would definitely count as a intrusive thought . I tend to have these from time to time but usually can bring myself down from them ... Just because we're capable doesn't mean we will . We do have this great thing in us called self control and it's just scary because we believe no normal person would ever think this way but from talking to my therapist she informed me everyone has these thoughts they're just able to let them go unlike us who tend to harbor them and give them way to much attention . I wish I could be more help to you but like I said I deal with them too so hopefully down the line we're able to cope better . Good Luck to you hopefully it's a thought that has passed