Playing golf is not the problem, as we know this is an extremely safe activity in terms of COVID transmission. However, what we have seen (me certainly) is that as soon as courses open there are people gathering socially for a beer and a chat and ignoring social distancing.
Golf clubs have fueled this behaviour with outdoor bars, marquees, patio heaters etc. The clubs are responding to demand from members so I don't blame them. It's just that there is always a minority that spoils it for the rest of us.
That is a golf club problem, not a problem with golf, and any clubs which have allowed that have been irresponsible in the extreme.
Ours have been strict during restricted periods, such as the return from lockdown in May. Arrive 10 minutes before your tee time, play golf, then go home. They have taken a really firm line with anyone socialising in the car park afterwards, be that for a sneaky beer from the boot of the car or simply gathering for a ten minute chat. A number of members have been suspended and a couple have seen memberships terminated for multiple transgressions.
Whilst not doubting that a minority of clubs have perhaps been a little lax, most I have been to have done all they can to be Covid compliant. Some have gone as far as roping practice greens into defined areas, allowing one golfer per area at a time.
Any club taking a relaxed approach have done themselves, and the rest of us, a huge disservice if social mixing off the course has contributed to a ban on golf, which it doubtless has.