yorkie I really feel for you. I notice things like that too. Although I am not a widow. But I have been told my DH is very very ill. Its something I have never actually spoken about on MN and I dont really want to get into it now. I just want you to know that I can sympathise.
However the people who are saying it really dont mean any harm. Its just done without thought.
Last night I was having the WORST night at work ever and someone asked me how I was and I said really sarcastically "Fine in the sense that I'd like to kill myself right now"
I obviously did/do not want to kill myself! And I have been devastated when I was much younger by my first boyfriend committing suicide. So I know its nothing to joke about. But I said it anyway. Afterwards I felt bad for saying it but it just came out.