Violence wherever it is, whatever way it is perpetrated is to be condemned and stopped. Violence in civil society cannot be justified whatever be the reason for it. When violence increases then we have to understand that society is becoming sick in mind.
Coming to the matter of domestic violence, it used to be there earlier also in many houses and mostly it was due to drinking habit of the male members. Then there were some other reasons also contributing to that like misbehaviour of one or other member in the house, helplessness due to poverty and sickness and blaming one another for that and marital mismatch . However it used to be tolerated for the sake of children, for common umbrella of a family. The help of elder members and relatives in the family helped to do fire fighting and salvage the situations. After a few years of co-habiting the spouses also become mature and more accommodative and tolerant to each other and the domestic quarrels may come down also.
But at present both partners working and earning, both partners drinking, education and awareness of women making them not to suffer lying down and even retaliating, extra marital relationships on the increase etc have become contributing factors for more domestic quarrels and leading to violence. Domestic quarrels are not just between spouse, but between siblings, parents and children etc too. Nowadays intoxication is caused not just by alcoholic drinks, but by various chemical drugs. Erosion of values, humans growing selfish and self centred, becoming impatient and emotional with slight provocation, difference between expectation and achievement etc. are modern day contributors to domestic violence.
The Covid lockdown situation has compelled people to be at home almost all time. People don't have a outlet literally and in spirit too. It is an old saying "familiarity breeds contempt'. So this working, even small things lead to frayed tempers and lead to quarrels and violence as people are simply frustrated and helpless due to various reasons. That is why domestic violence has increased during lockdown.