I'd be happy for them. A man wants a wife for more things than lust, someone to help him with children, clean, and take care of the home. A woman, especially one who has stayed at home during her first marriage, is practically incapable of taking care of herself financially. She also needs a father for her children. They can pray together, partake of the sacraments, and grow old together.
How many chapels have a fund for the support of widows and motherless children? If yours does have one, are these people who condemn others contributing to it?
Sorry but in today's world, it makes sense to remarry. There is almost no charity for widows and orphans among Catholics. The organizations that once did charitable works for Catholics are all but gone. Take away a mother, and you may have a father who puts his children in public school or hands them off to non-Catholics to raise. Take away a father, and mother can put her kids in public school and work at McDonalds, and be on state assistance programs her whole life.
Given how much traditional Catholics abhor state welfare, they would still condemn a woman and her children to it, because they don't like a valid second marriage?
I'd have them over and be their friends in a second, if we got along well. No problems. God alone is their judge.