We are with you during these dark days. Only time can heal and then never fully. I know, my family experienced a similar tragic hate crime several years ago. Try not to let the bitterness, which is only natural, eat you up and ruin the rest of your lives. Easier said than done.
How many times I have dropped my daughters off at concerts without even thinking about such a terrible tragedy what you have just experienced could happen. It’s heartbreaking to think of the pain what the families involved are now experiencing.
These people who did this are the scum of the earth and as far from the Muslim faith as one can get.
“Of all bad men religious bad men are the worst.” – C.S. Lewis

Say it, brother.
It is becoming apparent that British Muslims, some at Salman Abedi’s own mosque has alerted the authorities several (perhaps many) times that he was behaving strangely and threatening a terrorist action. Nothing of course was done.